9. How is this sentence correctly written?

A. Scientists and meteorologists are currently studying storms and to try to find better ways of predicting them.

B. Scientists and meteorologists are currently studying storms and tried to find better ways of predicting them.

C. Scientists and meteorologists are currently studying storms and try to find better ways of predicting them.

D. Scientists and meteorologists are currently studying storms and trying to find better ways of predicting them.​