Question

Select the number of the punctuation error in the following sentence:

Answer 1

I'd say that the number of the punctuation error in this sentence is 2, because you don't have to write and there as well.
It should be like this:
My sister is very confident, energetic, friendly, and she makes friends wherever she goes.

Answer 2

Answer:

3

Explanation:

My sister is very confident, energetic, and friendly, and she makes friends wherever she goes.

The option 2 would remove the comma after energetic which is wrong.

The answer options do not allow the removal of the unneeded "and"