You're correct. Let's clarify the sentence structure.
The sentence that maintains parallel structure is:
The committee met to discuss budgeting issues, recruiting new volunteers, and planning the end-of-year celebration.
All elements (discuss, recruiting, planning) should ideally match in form. In the original options you provided, none of them fully adhered to proper parallel structure.
To clarify: if we had a corrected version that maintains true parallelism for all items in the list, it would read as follows:
The committee met to discuss budgeting issues, to recruit new volunteers, and to plan the end-of-year celebration.
Thank you for pointing that out! The original sentence examples provided did indeed contain errors in their structures.