Directions: Read the following sentences (A, B, C, and D) and determine which of these sentences is/are grammatically and contextually correct.

A. Due to the new regulations, all employees must complete the compliance training by the end of the month.

B. The investment was risky, but he decided to go ahead with it knowing fullys the potential outcomes.

C. Research in renewable energy sources have gained significant momentum in recent years.

D. The museum's exhibit, highlighting ancient artifacts, draws tourists from all around the world every summer.