The letter that will be on the side opposite D is letter B
The attached image represents the missing piece in the question
The opposite sides of a cube always have a face in between them, when represented as a net.
From the attached image, the adjacent sides are:
A B C D
F C E
The opposite sides as represented above are;
A and C
B and D
F and E
Hence, the letter that will be on the side opposite D is letter B
Read more about cubes at:
https://brainly.com/question/1972490
#SPJ1