Rewrite the proportion 7:21 = 3:9 as a proportion using fractions.
O A) 7/21 = 3/9
OB) 7/21 = 9/3
OC) 21/7 = 3/9
OD) 7/9 = 3/21

Respuesta :

Answer:

a

Step-by-step explanation:

7/21=3/9 bc why would it be anything else?

a :) hope that helped