The correct answer is: from.
A blind man cannot distinguish light from darkness because he cannot see. The word “from” indicates a separation or distinction between two things. In this case, the blind man cannot distinguish between light and darkness because he cannot see either of them.
The other options are incorrect because they do not accurately reflect the meaning of the sentence. The word “between” indicates a position or relationship between two things. The word “with” indicates a connection or association between two things. The word “to” indicates a movement or direction towards something.
In conclusion, the correct answer is “from” because it accurately reflects the meaning of the sentence. The other options are incorrect because they do not accurately reflect the meaning of the sentence.