It was a hot, sunny day. I took my bicycle for a long ride. I rode it down the long road and across the bridge over the lake. I was having such a good time with my trusty friend. But after an hour or so, my bicycle seemed worn out. I wanted to go to the top of King's Hill. However, my bicycle just couldn't make it up the hill because _______. 

Which of these responses completes the joke with a pun?

 A. 

it was two-tired

 B. 

it ran out of gas

 C. 

it ran its course

 D. 

it fell asleep at the wheel

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