Which of the following statements is FALSE? a.
Before secession, most Texans in Southeast Texas had come from the “Old South.”
b.
In 1861, Texans voted overwhelmingly in favor of secession.
c.
Most Texans who opposed secession were from North or West Texas.
d.
Texans who opposed secession spoke out in large numbers across the state.

I know the answer and since I can't answer my own question I'm writing it here

The answer is - D