What act was introduced in the 1960s and updated in 1974 to improve transparency?

The Freedom of Information Act is the correct choice as it was initially enacted in 1966 and was amended in 1974 to enhance public access to government records. This act was designed to promote transparency by allowing citizens to request access to federal agency records, which enables them to better understand government operations and decisions. The amendments made in 1974 focused on improving the processes for obtaining information and included provisions to protect individuals' privacy while still fostering accountability and openness in government. This act embodies the principles of democratic governance by empowering the public with the right to access information that affects them.

Other options do not reflect the specific act known for its role in promoting transparency and public access to government information, which is why they do not fit the context of the question.