下列各对性状中，属于相对性状的是[ ]

A．玉米种子的黄色和白色

B．豌豆的高茎和蚕豆的矮茎

C．狗的长毛和黑毛

D．人的身高和体重

My father told me last night ______ we're going to the Food Festival this weekend.

My brother and I felt very excited. [ ]

A. whether

B. where

C. what

D. that