The sentence below has an unnecessary comma. The comma that should be deleted is located AFTER the word

After dinner, she, and her mother even washed the dishes, so I am not going to just leave without thanking them for the great meal, the birthday cake, and the gifts.

A) dinner
B) she
C) dishes
D) cake

B) she

Explanation:

The first comma after the word "dinner" is necessary because "After dinner" is an introductory phrase. So, we must put an introductory comma there.

The comma after "dishes" is necessary because the word right after is "so", which is one of the coordinating conjunctions (FANBOYS: For, And, Nor, But, Or, Yet, and So). A comma always comes right before one of these conjunctions.

The final comma after "cake" is also necessary because the sentence is listing out three or more items: great meal, birthday cake, and gifts. This is called a linker comma and it always separates items in a list.

Thus, the comma that is unnecessary is the one after "she" because this provides an unneeded pause in the middle of the sentence.

Hope this helps!

d. lennie pats too hard, and then panics.