Final answer:
The Scrap Heart at Tier 1 lets your team count as having one more Scrap and initially granted a Blitzcrank. After the change on 12/8/21, it grants both a Blitzcrank and an Ekko.
Step-by-step explanation:
The effect of obtaining a Scrap Heart at Tier 1 is that your team counts as having 1 additional Scrap, and initially it granted a Blitzcrank. However, a change occurred on 12/8/21 where the Scrap Heart now also grants an Ekko in addition to a Blitzcrank, not instead of one. So the correct answer to the student's question would be option A: "Your team counts as having 1 additional Scrap. Grants a Blitzcrank." This change added an additional bonus instead of replacing the previous one.