Apparently there 's a yearly motorcycle rally in Sturgis , SD ... Stopped for the night in the town of Wall . Harvey slept - alleluia!Thursday - Explored Wall Drug ( back in the 20s or 30s , some gentleman built his drugstore into a tourist attraction to try to keep the town from dying ) , had breakfast there , and went south into the Badlands . Also stopped in Mitchell to see the Corn Palace .

Generate a question about the above context.
Why is the speaker excited that Harley slept ?
Select from the following. a). Because they did n't want Harley prying , and now he was out cold and would n't do so . b). Because Harley keeps them up by asking annoying questions and they can finally sleep c). Because he is a baby and has been struggling to sleep through the night d). Because the writer wanted to sneak by when they returned and Harley being asleep allowed this