C. Hyphens are usually used to connect two words that forms a new word with a new meaning. In all of the other sentences, the hyphen divides a single word into 2 meaningless words instead of connecting 2 actual words.
Podsnap's Technique is drilled close by the Bokanovsky Process. Podsnap's procedure accelerates the development of the eggs from an ovary, permitting many eggs from a similar ovary to be treated in the meantime. This implies a huge number of siblings and sisters can be conceived in "a hundred and fifty bunches of indistinguishable twins, all inside two years of a similar age."
The answer is: D. understatement.
An understatement is the display of something as minor, worse or less significant than it actually is. In this case, the idea is treated casually or downplayed, which means somebody makes it appear less important than it is.
The rest of the options are incorrect because a hyperbole is an exaggeration not meant to be taken literally; a paradox is a statement that sounds reasonable but its conclusion does not make sense or is contradictory, and an irony means the opposite of what is being said.
