(B) 270°, 90°
We know that, measure of complete angle of clock is 360o.
From the figure, we can say that angle at 2 = (9/12) × 360o= 270o
Then, angle at 1 = 360o – 270o
= 90o
Therefore, measures of the two angles between hour and minute hands of a clock at 9 O’ clock are 270o and 90o.