Why Were Southern Slaveholders Anxious About the Loyalty of White

Why were southern slaveholders anxious about the loyalty of white Southerners who did not own slaves?

A) Non-slaveholders not only did not benefit from slavery, but slavery actually undermined their economic opportunities.
B) Non-slaveholders were susceptible to bribery by northern merchants.
C) Slaveholders believed that poor whites were stupid and might not understand their place.
D) White Southerners had a history of betraying elite planters.