This question has options. Answer the question about text:

Eighteen minutes later , having driven an average speed of 80 mph , we 're back at our house to collect the tickets . Forty - five minutes later , we 're at the airport . Unfortunately , we 're three minutes late for the final check - in .

Why were they late for check - in at the airport ?
OPTIONS: (i) They were unable to leave at an earlier time .. (ii) They had gotten lost trying to find their flight .. (iii) None of the above choices .. (iv) They had to drive back home to get their tickets ..
(iv)