In each of the following questions, a sentence is given with two blanks, indicating that some parts are missing. Choose the option that provides the correct pair of words to fit the blanks, making the sentence grammatically correct and contextually meaningful. Despite the ________ of fossil evidence unearthed in the remote valley, the exact evolutionary trajectory of the hominin species remains frustratingly ________, prompting researchers to fundamentally re-evaluate their long-held phylogenetic timelines.

The transition word "Despite" establishes a structural contrast between the amount of evidence found and the clarity of the conclusions drawn from it. If the evolutionary trajectory remains "frustratingly" unclear or mysterious, the first blank must represent a large amount of evidence (to create the paradox). "Profusion" means an abundance or large quantity, setting up the contrast perfectly. The second blank requires a word meaning mysterious or difficult to understand, making "enigmatic" the correct choice. • Options (a) and (c) use "paucity" and "dearth," both meaning a lack of evidence. It is perfectly normal to have unclear results when there is a lack of evidence, so using "Despite" with these words breaks the logical flow of the sentence. • Option (d) fails because if the evidence is a "multitude" and the trajectory is "transparent" (clear), there is no frustration and no reason to re-evaluate timelines. • Option (e) fails because a "smattering" (a small amount) would naturally lead to an "elusive" conclusion, neutralizing the need for the contrasting word "Despite".