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On a two-lane road, car A is travelling ...

On a two-lane road, car A is travelling with a speed of `36 km h^(-1)`. Two cars B and C approach car A in opposite directions with a speed of `54 km h^(-1)` each. At a certain instant, when the distance AB is equal to AC, both being 1 km, B decides to overtake A before C does. The minimum required acceleration of car B to avoid an accident is

A

`1 m//s^2`

B

`2 m//s^2`

C

`3 m//s^2`

D

`4 m//s^2`

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