Overcome
Fling
Control
Pour
Answer is Wrong!
Answer is Right!
The correct answer is C. Control.
The other options are not synonyms of rein.
A. Overcome means to defeat or conquer.
B. Fling means to throw something forcefully.
D. Pour means to cause a liquid to flow out of a container.
To rein something in means to control it or keep it in check. For example, you might rein in a horse that is getting too excited or you might rein in your spending if you are going over budget.