The solid which is generated when the semicircle is rotated about the line is:
Sphere.
<h2>Step-by-step explanation:</h2>
We know that when a semicircle is rotated about any line then the three dimensional figure or a solid that is formed on this rotation transformation is Sphere.
Hence, the correct option is:
Sphere.
( Also, a cylinder is obtained when a right triangle is rotated about a given line.
and a cylinder is obtained when a rectangle is rotated about a given line )
