How long did it probably take Chan to dig up the worms?

Choices:
A. several days
B. not enough information
C. a couple of minutes
D. a month
a couple of minutes
There was a boy named Chan who loved his parents, though they did not love him back; he was not even given a first name. He had been born in the wrong month, during the wrong phase of the moon, his parents told him, and had brought them nothing but bad luck. The promotion at the factory promised to his father was taken away at the last moment. The garden his mother worked in nearly every day never produced anything more than the most meager of weeds since Chan's birth. It was often sunny in the little Chinese village, but there was an almost constant gloom over their house, as if a rogue cloud were blocking the sun only over their property. And his parents, of course, blamed Chan for everything.
He was small for his age, and usually quiet. He liked to listen to people instead of talking, filling himself with stories. He was a good boy and always did as he was told, and could see the good in his parents, even if others couldn't. Every so often, his mother would allow him a sweet, or his father would bring home an origami folding kit. They didn't like to show it to others, but his parents could be kind. Chan was patient and knew they would love him eventually.
He was digging one day between the fence and the west side of the house for grubs to feed to his pet chameleon, Rainbow. It was a warm July day not long after his tenth birthday. He often went there because it was cool and damp from the shade of the trees, and the worms seemed to like it there. He never took more than he needed, then he thanked the grubs for sacrificing their lives so that Rainbow could remain living and being his pet. Chan was very kind-hearted when it came to grubs.