Because of the endurance required
to survive in the tundra, a biome marked by its frigid temperatures, such animals tend to have a thick layer of adipose tissue that insulates them.
(A) to survive
(B) for surviving
(C) of animals to survive
(D) for survival
(E) for animals’ survival
Solution: Original underlined phrase is wrong as the the preposition "because of" typically requires a noun or a noun phrase after it, not an infinitive. It is unclear whose survival is being referred to. It could be interpreted as the survival of the animals or the survival of something else entirely.
(A) to survive
As explained above,
INCORRECT(B) for surviving
This option uses the gerund "for surviving" awkwardly in this sentence. Gerunds are typically used as nouns or noun phrases. Also no reference to whose survival is discussed here.
INCORRECT(C) of animals to survive
This option could be misinterpreted as suggesting that the endurance itself belongs to the animals, rather than the survival being for the animals' benefit. The sentence structure is not concise.
INCORRECT(D) for survival
Same issue as in the original phrase i.e. It is unclear whose survival is being referred to.
INCORRECT(E) for animals’ survival
This option uses the preposition "for" appropriately, followed by the possessive noun phrase "animals' survival," creating a grammatically correct structure.
CORRECTOption E is the right answer