The correct answer is C. The sloppy, wet soccer field.
Explanation
According to the text, it can be inferred that the cause for Jen Smith to fall in the field was the bad conditions in which she was, as the author expresses it when saying that "Jen Smith tries to recover the ball, but she slips on the sloppy, wet field ". Also, it is necessary to clarify that the text does not refer to any other reason for the fall of Jen Smith during the soccer game. So the correct answer is C. The sloppy, wet soccer field.