In each of the following questions, choose the pair that correctly shows the singular and plural forms of the noun. Which of the given pairs denotes the correct singular–plural combination?

Explanation:
·         Option A: study → studies (Nouns ending in a consonant + y drop the y and add –ies). ·         Option B: dynamic → dynamics (Standard noun ending in a consonant takes a simple –s). ·         Option C (Correct): hypothesis → hypotheses (Greek-derived nouns ending in –is systematically change –is to –es in their plural form). ·         Option D: focus → foci / focuses (The Latin plural is foci with a single i, not focii). ·         Option E: thesis → theses (Nouns ending in –is change to –es in the plural, not –ises).