Arjun and his friend(a)/were walking towards(b)/the station when(c)/they met his common friend(d)/No error(e)

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Arjun and his friend(a)/were walking towards(b)/the station when(c)/they met his common friend(d)/No error(e)
1.(a) 2.(b) 3.(c) 4.(d)
Correct Answer: d [“their” should be used in place of “his”]