If the hands of a clock makes an angle of $90°$ , mark the possible time from the following options? 

Given: angle made by the clock's hand = $90°$

We know that each division of the clock represents $30°$

At  $3$pm, the minute hand of a clock is at $12$ and the hour hand is at $3$

And the no. of division between the two hands of a clock at $3$ pm is $3$ divisions.

Therefore, the angle formed is $3\times 30°=90°$

Hence, the correct option is option A.