The correct statement that explains why H2S is a stronger acid than water (H2O) is:
Sulfur (S) has a larger atomic size than oxygen (O), so HS– is a more stable, weaker base than OH–.
This is because larger atomic size leads to the formation of a more stable conjugate base (HS–) compared to hydroxide (OH–), thus making H2S a stronger acid than H2O.