请选择ABCD'l0n-[3o'O2e7t,q6| -Can you tell me how many colors _______ in a rainbow?7S9?)C9Z,m+]0`(H+h
-Seven.7S9?)C9Z,m+]0`(H+h
A. there are7S9?)C9Z,m+]0`(H+h
B. are there7S9?)C9Z,m+]0`(H+h
C. they are7S9?)C9Z,m+]0`(H+h
D. are they7S9?)C9Z,m+]0`(H+h