The conservative movement in the united states in the 1960s and 1970s called for

Lowering taxes.

Explanation:

The conservative movement was an action by the  Republican Party in the United states to display their business interests and a tax policy for recommendation. It was an anti-regulation and anti-union policy adopted to make known their  business interests. The actual movement started in the mid–1930s where there was an opposition by the politicians and the businessmen came together to fight against the liberalism of the New Deal established by President Franklin D. Roosevelt. The conservative Republican strength was solidified through the efforts of President Ronald Reagan in 1980. Their major achievements include tax reduction, greatly increased defense spending, deregulation, communism roll back policy, and a strong military system.

the answer would be choice c, cave paintings.