I think that: <span>( At that very moment Ivan Ilyich fell through and caught sight of the light, and it was revealed to him that though his life had not been what it should have been, this could still be rectified.): shows that Ivan Ilyich finally understands the cause of his suffering. I think that because it says "and it was revealed to him that though his life had not been what it should have been, this could still be rectified.", and I think that shows when he realises it.</span>
According to legend, kissing the stone endows the kisser with the gift of the gab, or great eloquence or skill at flattery.
C. Combine the sentences to condense the repetitive info. about inprovement.