The faces of a rectangular solid are square.
always
sometimes
never

The faces of a rectangular solid are sometimes square.

Step-by-step explanation:

We can consider the example of a cuboid.

It is a rectangular solid whose all faces are made of rectangles.

But if we will consider a example of cube; which is also a kind of rectangular solid whose all faces are made up of square.

so we can get some solids whose faces are other than squares as well and some whose faces are squares.

Hence, we could say that:

The faces of a rectangular solid are sometimes square.

if you explain the the question more correctly i might be able to answer this better

step-by-step explanation: