JEE Main 2020 Physics question

A particle moves such that its position vector where is a constant and t is time. Then which of the following statements is true for the velocity and acceleration of the particle :

• (A) and both are perpendicular to
• (B) is perpendicular to and is directed towards the originCorrect
• (C) and both are parallel to
• (D) is perpendicular to and is directed away from the origin