Nixon’s presidential win in 1968 marked
a. a turn away from liberal reforms.
b. a surge of support for the vietnam war.
c. a return to the liberal politics of the early 1960s.
d. a turn away from conservative politics.

A. a turn away from liberal reforms.

Nixon was a Republican representing conservative thinking. His victory demonstrated a move from the liberal reforms of JFK and L. Johnson.

Nixon was a conservative who wanted to reduce the size of the federal government and the federal programs put into place by the preceding presidents. He also moved troops out of Vietnam and began to ease Cold War tensions.

D. a turn away from conservative politics.

Explanation:

Nixon won a majority of the mainstream vote by a thin margin, yet won by an extensive margin in the Electoral College, conveying most states outside of the Northeast.  

Nixon's triumph denoted the beginning of a time of Republican predominance in presidential decisions, as Republicans won seven of the following ten elections.