The noun "manuscript" refers to a document, a hand-written piece of text. Additionally, a "rift" is a break, a rupture; a "truce" is a pause in fighting, a peace agreement that is only temporary; "fodder" means raw material to be sacrificed because it is mostly worthless; "assent" is agreement.

The correct answer is "wall."

"Bulwark" is a noun referring to a defensive wall.

"Fissure" means a cleft, or a crevice, a deep crack in something.

"Plateau" means a section of land that is flat, tableland, highland.

"Highway" means a heavily travelled road, freeway, or interstate.

"Depth" means the distance down or across something.

"Foundation" means the base, the bedrock, the support.

An atrocity is something horrific.

Flattery means to compliment someone.

"Trek" is a word meaning "a long arduous journey, especially one made on foot," so we need to pick out another word that means something like "journey." Since "expedition" means "a journey or voyage undertaken by a group of people with a particular purpose, especially that of exploration, scientific research, or war," "expedition" is the answer choice closest in meaning to "trek," so "expedition" is the correct answer.

"Intuition" is a noun that means "the ability to understand something immediately, without the need for conscious reasoning," so we need to pick out another noun that means something like "unconscious understanding." While "intention" may seem like a good answer choice because it sounds like "intuition," "intention" means "a thing intended; an aim or plan." Since "intuition" does not mean the same thing as "intention," it cannot be the correct answer. "Hunch," however, is a noun that means "a feeling or guess based on intuition rather than known facts," it is the answer choice closest in meaning to "intuition" and thus the correct answer.

A "flux" is a flow or a condition of constant change.

A "hiatus" is a break.

"Nicety" is a noun that can mean "a fine detail or distinction, especially one regarded as intricate and fussy," "accuracy and precision," or "a minor aspect of polite social behavior; a detail of etiquette." So, we need to pick out an answer choice that means something like "a fine detail," "accuracy," or "a detail of etiquette." "Attribute," a word that when used as a noun means "a quality or feature regarded as a characteristic or inherent part of someone or something," might look like the correct answer because both "nicety" and "attribute" can refer to characteristics, but "subtlety" is actually the better answer, because "subtlety" can mean "a subtle distinction, feature, or argument," and better captures the connotation of fineness, intricateness, or fussiness that is part of the word "nicety." So, "subtlety" is the correct answer.