Hello-! If anyone could help that would be great!

Thank you to anyone & everyone that helps-!!!
Find the area of the rectangle.
(Top part of the rectangle has 7x+1, and the right side has 8x)
A. 15x + 1
B. 56x^2 + 8x
C. 56x + 8
D. 15x^2 + 9x

Is the answer B....???
Thanks-!!!
- ❤~Mochi~❤