A municipal securities dealer makes a political contribution of $990 to a local mayoral candidate.

Step by Step Explanation:

MSRB Rule G-37: Requires municipal securities dealers to report contributions to the MSRB, even if the amount is below the $1,000 threshold that would trigger a two-year prohibition on municipal business.

Incorrect Options:

SEC and FINRA: Not involved in reporting political contributions for municipal securities.

References:

MSRB Rule G-37 (Political Contributions): MSRB Rule G-37.