Final answer:
The force of gravity causes the raindrops to accelerate when they form.
Step-by-step explanation:
The correct statement about the chain of events when raindrops form is b) The force of gravity causes the raindrops to accelerate.
When raindrops form, the force of gravity pulls them towards the ground. This force causes the raindrops to accelerate. The acceleration due to gravity is constant at any given location on Earth and has its own symbol, g. It is the same for all objects, regardless of their mass.