Explanation:

About Engineers Day

• Engineers Day is celebrated every year on the birth anniversary of Sir Mokshagundam Visvesvaraya on September 15.
• He was an Engineers who planned the Indian Economy in 1934, before Independence.
• He designed a flood protection system for the city of Hyderabad by Mussi River and also played a key role in developing a system to protect Vishakapatnam port from sea erosion.
• He also played a key role in the development of the Block System which would prevent the wasteful flow of water in dams.
• He was awarded the nation’s highest honour, Bharat Ratna in 1955 for his outstanding work as a chief engineer in the construction of Krishna Raja Sagara dam.

Hence option 3rd is correct.