Context: Figure: Serengeti National Park.
Serengeti National Park is a savanna grassland ecosystem in Tanzania, a country in eastern Africa. Many types of animals migrate through the park each year.
Which statement describes the Serengeti National Park ecosystem?
A. It has warm summers and warm winters.
B. It has a small amount of rain.
Determine the correct option from the provided choices and reply with its corresponding letter.

A