Consider the following factors which are taken into account for computing braking distance. 1. Reaction time 2. Speed 3. Coefficient of longitudinal friction 4. Gradient

Consider the following factors which are taken into account for computing braking distance. 

1. Reaction time 

2. Speed 

3. Coefficient of longitudinal friction 

4. Gradient

A. 1 and 3

B. 1, 2 and 4

C. 2, 3 and 4

D. 2 and 3

The correct answer is option 'C. 2, 3 and 4'. Can you explain this answer?

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