Across section is the intersection of which two elements?
a.) a solid and a lineb.) a solid and a planec.) a plane and a planed.) a plane and a line

Option b is correct that is a solid and a plane.

Step-by-step explanation:

The  cross section means when two three dimensional intersects and gives the two dimensional figure.

Option a:

A solid and a line is not correct because line is not a three dimensional figure.

Option b:

A solid and a plane is correct because both of them are three dimensional figures for example:

If a plane cuts a sphere it will give circle which is a two dimensional figure.

Option c:

A plane and a plane when intersects gives a line which is not a two dimensional figure.

Hence, incorrect.

Option d:

A plane and line is not correct because line is not a three dimensional figure.