Motion in a plane

Read each statement below carefully and state with reasons, if it is true or false :
(a) The magnitude of a vector is always a scalar, (b) each component of a vector is
always a scalar, (c) the total path length is always equal to the magnitude of the
displacement vector of a particle. (d) the average speed of a particle (defined as total
path length divided by the time taken to cover the path) is either greater or equal to
the magnitude of average velocity of the particle over the same interval of time, (e)
Three vectors not lying in a plane can never add up to give a null vector.