The correct answer is A. Indravati, Sheonath, Rihand, Mand.
The Indravati is the longest river in Chhattisgarh, with a length of 520 kilometers. The Sheonath is the second longest river in Chhattisgarh, with a length of 470 kilometers. The Rihand is the third longest river in Chhattisgarh, with a length of 420 kilometers. The Mand is the fourth longest river in Chhattisgarh, with a length of 350 kilometers.
Option B is incorrect because the sequence of the rivers is not in descending order of length. The Sheonath is longer than the Indravati in this option.
Option C is incorrect because the sequence of the rivers is not in descending order of length. The Mand is longer than the Indravati in this option.
Option D is incorrect because the sequence of the rivers is not in descending order of length. The Rihand is longer than the Indravati in this option.
Option E is incorrect because there is a correct answer.