Could you explain what purpose asking or knowing serves? Is it simply to allay suspicions? And if so, why do you suppose those suspicions exist in the first place?
For my part, as DM, I don't think I need to know. I'm only tasked with adjudicating an action that is taken, not in getting an explanation for one that is not taken. (Or, frankly, even for ones that are taken unless somehow it's related to deciding if the approach to the goal is likely to succeed, fail, or whether it's uncertain.) So I'm trying to understand another point of view here.