a) True statement.

A vector's magnitude is a number. therefore, it is a scalar.

b) False statement.

Each vector component has its own magnitude and direction. As a result, it is a vector quantity.

c) False  statement.

Displacement is a vector quantity, while total path length is a scalar quantity. As a result, the total path length is always greater than the displacement magnitude. And when a particle moves in a straight line it become equal to the magnitude of displacement.

d) True statement.

This is due to the fact that the total path length is often greater than or equal to the magnitude of a particle's displacement.

e) True statement.

Three vectors that do not lie in a plane cannot be described in the same order by the sides of a triangle.