The answer for part A is right ??
And please help me in part B and C

The answer is 7 sides and 2 bases.

Step-by-step explanation:

This is a seven (7) sided shape on its lateral

Then we have a top and a base making it a nine (9) altogether for Surface area.

Because it is a polygon just like a prism we only see its shape on the base when you tilt it, so the top of the net is drawn can also be drawn on its side. See attached last few pages.

We draw it on its base so we can see both the cross section is vertical and slice the heptagon. Here we can call it a vertical heptagon prism. As its on its base the height would be high to low and look like a watch on the arm whilst the arm is reaching for the door. The measurements of the bases would be 2x the height at its longest point on the actual top and base. (As long as they are not more than 2x it would represent the shape when it becomes a prism.

All the pictures may not be relevant but it helps you understand area 1/2 x 1 = 1/2   so 1/2 x 2cm = 1    and 2 x 2 = 4 for other shapes.

We cna use these measurements when showing the bases are twice the size and also label height H = 2cm  and Length = 4cm

For the heptagon.  The area is worked out a different way but this may help you get used to multiplying half when working with shapes.

i think the answer is d im not sure