Which of the following physical quantities is considered as vector?

Wood floats in water because _____

A cyclist moves from a certain point $X$ and goes round a circle of radius $r$ and reaches $Y$.
The displacement of cyclist will be:

Consider the following statements:

A. The magnitude of a vector is always a scalar.

B. The total path length is always equal to the magnitude of the displacement vector of a particle.

C. The average speed of a particle is either greater or equal to the magnitude of the average velocity of the particle over the same interval of time.

D. Three vectors not lying in a plane can never add up to give a null vector.

Which of the statements given above are correct?