Considerfollowing Options for a Simple Rankine Cycle

Considerfollowing options for a simple Rankine cycle
i. increasing pressure at exist of turbine
ii. increasing average temperature of heat addition
iii. decreasing pressure at exit of turbine
iv. superheating of steam
v. decreasing pressure during superheating.
Which combination of above will increase Rankine efficiency?

A) i, ii & iv
B) i, ii & v
C) iii, iv & v
D) ii, iii & iv