In an accurate clock, in a period of 2 hours 20 minutes the minute hand will move over = ?

Answer: Option D

Angle traced by the minute hand in 2 hours 20 minutes,i.e.,
$$\begin{array}{rl}& =140\text{ minutes}\\ & ={\left(\frac{360}{60}\times 140\right)}^{\circ }\\ & =840^{\circ }\end{array}$$