Why Does a President Typically Use Partisanship as a Criterion

Why does a president typically use partisanship as a criterion in selecting nominees to the Supreme Court?

A) Moderate judges tend to be less decisive.
B) The norm of senatorial courtesy requires the president to do so.
C) The leaders in the president's party put tremendous pressure on the president to choose a loyal party member.
D) The president wants to choose a nominee with similar political views to advance the president's legacy.
E) Judges with experience in party politics are often the most knowledgeable and realistic about politics and policy.