The green area on this map of California is called the Central Valley. It produces 40 percent of the fruits and nuts eaten in the United States. It sits between the Pacific Coast mountains on the west and the Sierra Nevada mountains on the east. Wind in California blows from west to east.
What is a likely explanation for why the Central Valley is not a desert?

The Sierra Nevada mountains do not have a rain shadow

The Sierra Nevada mountains block the Pacific Coast rain shadow.

Rain shadows can only form on the west side of mountain ranges.

The Pacific Coast mountains are not tall enough to block all of the rain.