Which sentence in this excerpt from leo tolstoy's the death of ivan llyich shows that ivan llyich finally understands the cause of his suffering

Determine the meaning of the word *propel* using the context clues in the sentence. wind power is the ability to capture the wind in a way to *propel* the blades of wind turbines. a) to move slowly b) to urge onward c) to stop from moving d) to drive, or cause to move, forward