1) E
Volume increases by a lot whilst the depth increases by a little amount at either end.
A small increase in volume for a large increase in depth in the middle. Therefore, the shape would have to be wider at the top and the bottom and narrower in the middle.
A – Wrong
The shape is not narrower in the middle.
B – Wrong
The shape is actually wider in the middle. So this is definitely wrong.
C – Wrong
The shape is actually wider in the middle. So this is definitely wrong.
D – Wrong
The shape is actually wider in the middle. So this is definitely wrong.
E – Correct
The shape is wider at the top and bottom whilst narrower in the middle.