If the number 52,1n8, where n represents the tens digit, is a…

If the number 52,1n8, where n represents the tens digit, is a multiple of 3, then the value of n could be which of the following?

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #39566