Haha, the double asterisk in Option C made me chuckle. Is that some kind of secret code for the programmers? Anyway, I think Option B is the way to go.
I'm going with Option D. The double asterisk looks like it might be a typo, but that's the only option that actually assigns the result to the variable 'a'.
Option B makes the most sense to me. It explicitly returns the result of the multiplication, which is what the expected output seems to be looking for.
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