"Unbreakable" is a book written by Mary Kom, the renowned Indian boxer and Olympic bronze medalist. The book details her life, struggles, and achievements in the field of boxing. Mary Kom is a celebrated athlete and a prominent figure in Indian sports.

The War of American Independence, also known as the American Revolutionary War, took place between 1775 and 1783. Therefore, the correct option is not listed among the provided choices. If we consider the closest option, (D) 1776, it is a significant year within the timeframe of the war as the Declaration of Independence was adopted on July 4, 1776. The war itself had already begun in 1775.

The correct answer is Cricket. Sheesh Mahal Cricket Tournament, the oldest summer cricket event in the country. The tournament was started in 1951 by cricket enthusiast M Askari Hasan to satiate the urge of fans who were usually devoid of the sport during the summer season.