The role of the lieutenant governor can vary by state, but generally, the most common duties include:
- Presiding over the state senate (which corresponds to option b)
- Serving as a tie-breaking vote in the state legislature (which corresponds to option c)
- Assuming the duties of the governor in their absence or incapacity (which corresponds to option d)
Based on the options provided, the most accurate answer that captures a primary responsibility of a lieutenant governor would be:
c. To cast the tie-breaking vote in the state legislature.
However, it's important to note that also, options b and d are significant roles of the lieutenant governor in many states.