One of the Weaknesses of California's Massive Agricultural Economy Is

One of the weaknesses of California's massive agricultural economy is what?

A) Its reliance on underpaid migrant labor from Latin America.
B) The amount of farms starting to become unusable for agriculture because of the overuse of pesticides.
C) Too much farmland has been used for industrial farming and cannot be used for organic farms.
D) The extinction of native species,due to loss of habitat,has resulted in certain plant eating insects and animals no longer having natural predators.