Hmm.. I believe it's 3. sorry if it's wrong. Use commas to separate independent clauses when they are joined by any of these seven coordinating conjunctions: and, but, for, or, nor, so, yet. ...
Answer:
<em>If you need to talk, dont hesitate.</em>
Explanation:

All the boys are good at cooking , but <u>she</u> is as good as the girl
Able. A suffix is added to the end of a word