James , in a fit of laughter slapped Artie 's back , and for some reason , this caused Artie 's head to randomly explode . James stopped laughing and turned to look when his horse suddenly reached up , with its neck stretching to accommodate its actions , and bit off James ' head . Both human bodies then fell off their horses , only to sink like bricks in quicksand in a pile of horse manure .
What stopped James 's laughing fit ?
Pick the best answer from the following options:
A. He fell off his horse because he was laughing .
B. None of the above choices .
C. He did n't pay attention and fell into the horse manure .
D. He made his part of his friend blow up .


D