Which date would be the new Expiry date or this member after the tier is upgraded to Gold?

The Loyalty Administrator for Northern Trail Outfitters (NTO) insider program defines tier groups-Status Tier Group with a Fixed model and period of one year.

The three tier are defined =Silver (base), Golden (next tier), and Platinum (the highest tier)

Extend Expiration for this tier group is Qualifying Points Reset Date.

A member joins NTO insider in the Silver tier and, after a year of engagement, gets upgraded to the Gold tier on March 16 2023.

Which date would be the new Expiry date or this member after the tier is upgraded to Gold?
A . December 31, 2024
B.March 31 2024
C. December 31, 2023
D. March 16, 2020.

Answer: B