The correct answer is: A. 11 December
International Day of Engineers, recognized by India, in remembrance of Sir Mokshagundam Visvesvaraya is observed on 11 December.
Sir Mokshagundam Visvesvaraya was an Indian engineer, statesman, and philanthropist who served as the Diwan of Mysore from 1902 to 1912. He is considered one of the greatest engineers of India and is known for his contributions to the fields of irrigation, public health, and education.
The United Nations General Assembly declared 11 December as International Day of Engineers in 2014. The day is observed to celebrate the achievements of engineers and to promote the role of engineering in society.
The other options are incorrect because they are not the dates on which International Day of Engineers is observed.