Denny Allows Elbert to Store His Trailer on Denny's Property

Denny allows Elbert to store his trailer on Denny's property for $20 a month while Elbert works temporarily at a distant job site. Later, Denny no?tices rainwater collecting in the trailer and covers it with a tarp at a cost of $50. This cost is most likely borne by

A) Denny and Elbert in equal measure.
B) Denny.
C) Elbert.
D) Cody's employer.