This checks the year of the law that gives ASI its legal power to protect monuments.
AMASR Act, 1958: correct. The Ancient Monuments and Archaeological Sites and Remains Act was passed in 1958, and it lets ASI declare and protect monuments and sites of national importance.
AMASR Act, 1968: wrong, this is not the year the Act was passed, just a decade later trap.
AMASR Act, 1978: wrong, this year is two decades off from the real date.
AMASR Act, 1948: wrong, this year comes before the Act was actually passed, just a decade earlier trap.