The efficiency of the vapour Rankine cycle can increase by

Question

Consider the following statements:

The efficiency of the vapour Rankine cycle can increase by 

1. Increasing the temperature of the working fluid at which heat is added.
2.  Increasing the pressure of the working fluid at which heat is added.
3. Decreasing the temperature of the working fluid at which heat is rejects.

Which of these statements is/are correct?

(a) 2 and 3                   (b) 1 only

(c) 1 and 2                   (d) 1,2 and 3