Question

Read the sentences.

Answer 1

The first one is the best answer

Answer 2

The best answer would be the first one: Bill and Allen both spent all day Saturday raking leaves to the curb for pickup.
The second one isn't even a full sentence; the third has improper punctuation, and the fourth one isn't even a proper sentence and it has improper punctuation as well.
So, this goes down to the first answer. It is a complete sentence, it fully describes them both doing the same thing like the original sentence does, and everything is described just like the original.