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A person goes to office by car or scoot...

A person goes to office by car or scooter or bus or train, probability of which are I /7, 3/7' 2/7 and 1/7 respectively. Probability that he reachs office late, if he takes car, scooter, bus or tram 1s 2/9, 1/9, 4/9 and 1/9 respectively. Given that he reached office in time, the probability that he travelled by a car is

A

a) 1/7

B

b) 2/7

C

c) 3/7

D

d) 4/7

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