Who is authorized to serve a legal process if the sheriff is disqualified?

The coroner is authorized to serve legal process when the sheriff is disqualified. This authority is rooted in the need for the execution of legal responsibilities to continue smoothly, even when the sheriff is unable to serve due to disqualification or specific circumstances that prevent them from performing their duties. The coroner's role within the county includes responsibilities beyond death investigations, and part of that includes being an officer of the law.

In the context of this question, other positions like a judge, treasurer, or county clerk do not typically have the legal authority to serve legal processes. Judges are primarily responsible for presiding over court proceedings, treasurers manage county finances, and county clerks handle administrative tasks including record-keeping but do not have the authority to serve legal documents. Thus, the coroner stands out as the correct answer, fulfilling the need for legal processes to be served even in the absence of the sheriff.