If an object moves in a circular path, this type of motion is called uniform circular motion.
The speed of the object is constant in this type of motion.
As velocity is a vector quantity, it keeps on changing. It can be given by drawing tangent to the circle.
Acceleration acts towards the center of circle.
Hence, out of the given four options, the correct statement about a planet orbiting a star in uniform circular motion is (d) i.e. The acceleration vector of the plant points towards the center of the circle.
