(c) It is fundamental co0ncept of indeterminate $ie,\ \ \ \ \ \ \ \ \ \ \ \ \ \lim_{x \rightarrow \infty}\frac{\sin x}{x} = \frac{\sin\infty}{\infty}$ $= 0 \times finite\ term = 0$
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.