One Way to Reduce the Separation of Powers Called for in the U.S

One way to reduce the separation of powers called for in the U.S. Constitution would be to

A) allow the president to serve two consecutive terms in office.
B) allow Congress or the president to call for special elections between regular elections.
C) forbid the president to appoint members of Congress to serve in the cabinet.
D) reduce the term of office for members of the House of Representatives from four years to two years.
E) forbid the president to select cabinet members.