Which value in the CHANGE SCORE Flow Step will reset the leads’ score?

The email marketing manager wants to reset the score for all leads who have been unengaged.

Which value in the CHANGE SCORE Flow Step will reset the leads’ score?
A . -100
B . {{System.Reset}}
C . Reset
D . = 0

Answer: D

Explanation:

Reference: https://nation.marketo.com/t5/Product-Discussions/Change-Score-Flow-vs-Change-Data-Value-Lead-Score/m-p/190403