Explanation
$$ \textbf {Step1: Draw a relevant figure.}$$
At 9 O'clock the minute hand will be at 12 and the hour hand will be at 9 as shown in figure.
$$ \textbf {Step 2: Identify the angles.}$$
From the above figure, we can say that the angle between hour hand and minute hand of the clock is 90,270.
$$ \textbf {Hence, option B is correct.}$$
Please disable the adBlock and continue. Thank you.