The story is about a boy who anxiously watches his father's art exhibition in a gallery, as shown in option C.
Reading the text above, we can see how the boy is excited, admired, and surprised by his father's ability to paint so many pictures. The boy can hardly believe it, going so far as to ask his father if the paintings had been painted by himself.
The father answered yes, which allows the reader to understand that the boy is in his father's art exhibition.
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