— are your pens?— blackA．What; It’sB．What color; They’reC．Where; Them

问题补充：

— are your pens?

— black．

A．What; It’s

B．What color; They’re

C．Where; Them

答案：

解析：本题回答语表示的是颜色，对此提问用what color，故本题选B。