Find the surface area of this rectangular prism

Answer:
D=102
Step-by-step explanation:
9+9=18
21x4=84
84+18=102
Answer:
D. 102 Square Unites
Step-by-step explanation:
First you do 7 x 3 to get 21
Then you do 21 x 4 to get 84
After that you do 3 x 3 to get 9
Finally you take 9 x 2 to get 18 and add that to 84 to get 102 Units