First Question
A is not correct. If you have one point, you wouldn't know where the line would extend. You need at least two points to determine a line. You need at least three points if you don't know if the line is linear.
B is correct. A ray has one endpoint and extends infinitely in one direction.
C is not correct. A line segment has two endpoints and does not extend infinitely.
D is not correct because a line is infinitely extending. It has no endpoints.
Second Question
A is not correct. Skew lines are two or more lines that do not intersect, are not parallel, and are not coplanar.
B is correct. Perpendicular lines must intersect at a right angle.
C is not correct. Two parallel lines can lie in the same plane.
D is not correct. A transversal is a line that intersects two or more other lines. This does not have to be four other lines (but it can).
