No, it cannot. A cube can cast a shadow in the shape of a square.

Yes. The shape of shadow of a circular pipe can be a rectangle.

In a die, the sum of numbers on opposite faces is always 7.

So, A + 5 = 7

Hence, the value of A is 2.

In a die, the sum of numbers on opposite faces is 7.

Therefore, the sum of the numbers on the faces opposite to 4 and 3 = (7 - 4) + (7 - 3) = (3 + 4) = 7

It is given that it is the figure of a opened die, we know that the sum of numbers on the opposite faces of a die is 7.
So, the number on the opposite face of D is 4.
$⟹$ D + 4= 7
$⟹$ D = 7 - 4 = 3
$⟹$ D = 3

The corners of a solid shape are called its vertices; the line segments of its skeleton are called its edges; and its flat surfaces are its faces.

It is given that the figure can be formed in the shape of the die, we know that the sum of numbers on opposite faces of a die is 7.
When we form a die with the given shape, the number on the opposite face of A , B and C will be 2,1 and 3 respectively.
So, number on the opposite face of B is 1.
$⟹$B+1=7 
$⟹$B= 7-1 = 6
$⟹$B= 6

In a die, the sum of numbers on opposite faces is 7. 

So, 3 + C = 7

C = 4.

Answer: Option B. ->

A cylinder is a combination of two circular shapes and one rectangular shape.

Answer: Option B. ->

In a die, sum of numbers on opposite faces is 7.

Hence, A + B = 7 and C + 5 = 7 hence C = 7 - 5 = 2.
Therefore, A + B + C = 7 + 2 = 9.