I'm fairly certain the answer Is, A, True.
Answer:
B - We can go on a picnic, but it may rain.
Explanation:
The comma in option b seperates the independent clause (We can go on a picnic) from the dependent clause (but it may rain). It is also the natural 'pause'.
Answer:
Dr.Burke wanted to trust her assistant with the secret formula,but she was afraid her assistant was a spy.
A. Satisfied employees, with good supervision, achieving or surpassing their performance goals