Lines a and d are
non - coplanar
parallel
perpendicular
skew

it is skew

C (Perpendicular)

Step-by-step explanation:

Non-coplanar: No on the same plane

Parallel: (Like train tracks) Never intersects at any point

Perpendicular: Intersects at some point (looks like a T at the intersection)

Skew: Lines aren’t parallel or intersecting

Option C.

Step-by-step explanation:

Non - coplanar : If two lines do not lie on the same plane, then they are called non-coplanar lines.

Parallel lines : If the distance between two lines remains same and they never intersect each other, then they are called parallel lines.

Perpendicular line: If two lines intersect each other and form right angle, then they are called perpendicular lines.

Skew lines : If two lines lie on different plane and do not intersect each other, then they are called skew lines.

From the given figure it is clear that lines a and d lie on the same plane M and form right angle. So, lines a and d are perpendicular.

Therefore, the correct option is C.

there is no question content here, but you for the free points! : d

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