Adam contracts with Jason to install a new skylight in Adam's bathroom. Before Jason is finished with the project, it starts to rain. Adam could have easily covered the hole with a tarp to prevent any damage but did not do so. The rain causes $4,000 in damage. What would most likely limit Adam's ability to collect damages from Jason?

a) Lack of contractual agreement
b) Act of God doctrine
c) Negligence of Jason
d) Failure to provide proper materials