Answer:
H2SO4
Step-by-step explanation:
In order to be diprotic it must have 2 hydrogen protons to donate.
Option A only has 1 so it will be eliminated.
H2CO3 is a weak acid, hoocch2cooh is a weak acid, and H2SO3 is a weak acid.
Therefore the only strong acid with 2 protons to donate is H2SO4.
H2SO4 has greater polarity due to the Sulfur atom compared to CO3 which has a carbon atom. This makes it a stronger acid.