If you want to join the science club; you may sign up in room 318. choose the answer that is the most effective substitute for the underlined part of the sentence. if no substitute is necessary, choose ‘leave as is.’ a) leave as is. b) join the science club, you may sign up c) join the science club: you may sign up d) join the science club you may sign up

The answer that is the most effective substitute for the underlined part of the sentence is "join the Science Club, you may sign up"

Explanation:

The example sentence is an If clause, or an if conditional, this kind of sentences connect the two ideas with a comma when the first sentence starts with the word "If", the punctuation of the sentence is incorrect by using a semicolon instead of a comma to connect the two part of the complete clause into a single one.

the answer is d. she became an english professor at university of georgia.