Operation Flood deals with:

Nationwide Milk Grid

The correct answer is Option (1) → Nationwide Milk Grid

This program, launched in 1970, was a landmark rural development initiative by the National Dairy Development Board (NDDB) of India. It was the world's largest dairy development program. Its goal was to increase milk production, empower dairy farmers, and create a strong cooperative structure to connect milk producers with consumers across the country. The program is widely credited with transforming India from a milk-deficient nation into the world's largest milk producer.

Note: This question is from prerationalised NCERT.