Question

two lines intersect at a ... (options: intersection, point, line, angle)

Explanation:

In geometry, when two lines intersect, they meet at a single point. "Intersection" is a concept, not what they intersect at. A line is infinite and two lines can't intersect at a line (unless they are coincident, but the question implies a typical intersection). An angle is formed by the intersection, not what they intersect at. So the correct term is "point".

Answer:

1. point