Why was it significant that President Reagan appointed three justices to the Supreme Court?

Read the excerpt about United States Supreme Court justices.

All Justices are nominated by the President, confirmed by the Senate, and hold their offices under life tenure.

—"Our Government: The Judicial Branch,” whitehouse.gov

Why was it significant that President Reagan appointed three justices to the Supreme Court?

A). Reagan’s top aides were confirmed for life by the Court.
B). Reagan’s nominees to the Court had the support of the Senate.
C). Reagan’s influence on government lasted long after his time in office.
D). Reagan’s policies were guaranteed to receive approval from the Court.