Enslavers supported slave codes passed in response to a. labor shortages b. drought c. enslaved african american revolts d. abolitionist rhetoric

C. enslaved African American revolts

The slaves’ codes were state laws established to control the status of slaves and the rights of their masters. Slave codes placed harsh restrictions on slaves' already limited freedoms in order to prevent them from rebelling or even escaping.  

b. major john c. frémont led a rebellion called the bear flag revolt.

explanation:

during the bear flag revolt, from june to july 1846, a small group of american settlers in california rebelled against the mexican government and proclaimed california an independent republic. the republic was short-lived because soon after the bear flag was raised, the u.s. military began occupying california, which went on to join the union in 1850. the bear flag became the official state flag in 1911.