Get (one’s) act together

Do you know the English expression “get (one’s) act together“? Read the conversation below. Can you guess the meaning?

Sandra: I’m not happy with the quality of Jennifer’s work. She has been making so many mistakes and coming to work late over the past few weeks. She needs to get her act together. 

Robert: I was thinking the same thing. If she doesn’t get her act together soon, I think we are going to have to fire her.

Does it mean:

a) be more considerate

b) stop making mistakes

c) be more proactive

d) be more organized and work in a better way

The answer is below! ↓

 

Answer: d) be more organized and work in a better way