Why Did Southern States, at Least at First, Replace Mandatory

Why did southern states, at least at first, replace mandatory death penalty statutes with discretionary death penalty statutes?

A) to give jurors the opportunity to consider the unique circumstances of the crime and the unique characteristics of the defendant
B) to allow all-white juries to take race into account
C) to force jurors to pay more attention during capital trials
D) to give legislators greater discretion in capital cases
E) all of the above