To convert the speed from km/hr to m/s, use the conversion factor:

\[
1 \text{ km/hr} = \frac{1000 \text{ meters}}{3600 \text{ seconds}} = \frac{5}{18} \text{ m/s}
\]

Given the speed is \(90\) km/hr:

\[
90 \text{ km/hr} \times \frac{5}{18} \text{ m/s per km/hr} = 25 \text{ m/s}
\]

So, the speed of the car in meters per second is:

A. 25 m/s