B. Adults must follow the advice they give children
The way you know the subject of the sentence is plural is because it takes a plural verb. You can see that the subject of the sentence is <em>the ova </em>(plural for of Latin word <em>ovum</em>, <em />meaning egg cell), and the verb it takes is <em>undergo </em>(plural)<em>, </em>and not <em>undergoes, </em>which would be singular.
B, exaggeration, it makes it seem obvious and it adds in mocking and humor as well.
The line from Act II of Hamlet which is a metaphor is the second choice:
Which done, she took the fruits of my advice.
Metaphor is a type of symbolic representation when one thing is referred to by mentioning another. So, if you say - He's a lion, you don't really mean that he is an animal, but rather strong and fearless.
So here, the fruits of my advice aren't really any fruits, but rather the instructions that he had to give her.