Two lines intersecting at a right angle ?

Yes, it is perpendicular

Parallel is when you have two lines that do not intersect

A ray is a line that has one definite starting point and no obvious end point. (Stars with a point and "ends" with an arrow, meaning that it goes on "forever")

A line is just one specific line

When you have perpendicular, that is when two lines cross each other forming a right angle as you may now know

Hope this helps :)

based on context clues you gave i'm assuming the answer would be c.