A metaphor is a figure of speech that compares two things by saying the first thing is the second thing. Greta is obviously not actually a fish but she swims like one so the author used a metaphor.
WHY THE OTHER ANSWERS DO NOT WORK:
A pun is a joke exploiting the different possible meanings of a word. There is no joke being made here so the sentence is not a pun.
Personification is a form of metaphor in that human characteristics are attributed to nonhuman things. Greta is a human so this sentence is not an example of personification.
A simile is a figure of speech that compares two things using the terms "like" or "as". Neither of those phrases were used, so this sentence is not a simile.
The answer is B. Controlling Trade. I have taken the test. Tip: Try to talk more formally it is more beneficial, and if you could speak more formal, you would be able to be understood better.
