The correct answer is option 3.

Option 3 pairs the power generation plants with their correct feed material as follows: M/s Gowthami Solvents Oil Limited, Andhra Pradesh uses Rice husk (A); M/s KM. Sugar Mills, Uttar Pradesh uses Distillery spent wash (C); M/s Satia Paper Mills, Punjab uses Black liquor (D); M/s Al Kabeer Exports Limited, Andhra Pradesh uses Slaughter-house waste (B).

Breaking down other options:

- Option 1 and 2 pair Distillery spent wash (C) with M/s Gowthami Solvents Oil Limited, Andhra Pradesh, where in fact, this factory uses Rice husk (A) as feed material. Option 1 further misplaces black liquor (D) to M/s Al Kabeer Exports Limited, Andhra Pradesh instead of it being used by M/s Satia Paper Mills, Punjab.

- Option 4 incorrectly attributes Rice husk (A) to M/s Gowthami Solvents Oil Limited, Andhra Pradesh and Distillery spent wash (C) to M/s KM. Sugar Mills, Uttar Pradesh.

It`s essential to understand the fundamentals of power generation plants and their specific feed materials to avoid confusion