help me please and thank u

Look at these details from a paragraph about the same topic:
• Helicopters are sometimes used to carry loads of water that help put out forest fires.
*Ships in the middle of the ocean often receive supplies from helicopters.
*Helicopters can be used to rescue people in hard-to-reach areas.
Choose the main idea that ties all the details together.
A. Helicopters can carry heavy objects to help with construction.
B. Helicopters are used to complete tough jobs.
C. Helicopters are used to help fight fires and deliver supplies.
D. Helicopters move in special ways.​