An Insurance Underwriter Wonders Whether Sports Cars "Cause" People to Drive

An insurance underwriter wonders whether sports cars "cause" people to drive too fast or whether those with a propensity for speeding are drawn to sports cars. She secures some research funds and recruits 100 car buyers to her study. She randomly assigns 25 drivers to each of four groups: 1) sports car white, 2) sports car red, 3) sedan white, and 4) sedan red. The primary research questions are: 1) Do sports cars make people drive faster? and 2) Does color make a difference? The underwriter worries that gender affects driving behavior and thinks it may actually be a confounder. She decides to randomize males and females separately. This is a:

A) randomized study with one factor and two blocking variables.
B) randomized study with two factors and one blocking variable.
C) randomized study with three factors.
D) None of the answer options is correct.