The correct option is D i-a,c, ii-b,d iii-a,c, iv-a,b,c,d
i. In the uniform circular motion, the acceleration and the velocity are perpendicular to each other, but in non uniform circular motion the angle between the velocity and the acceleration lies between 0 to π/2.
ii. In a straight line motion, the acceleration vector and the velocity vector are collinear to each other, i.e., the angle between them is either 0 or 180∘
iii. In a projectile motion, the angle (θ) between th velocity and the acceleration can vary from 0<θ<π
iv. In space angle between velocity and acceleration may be 0≤θ≤π