The magnetic moment of the high  spin complex is 5.92 BM. What is the electronic configuration? 

Hydrated copper sulphate$CuS{O}_4.5H_{2}O$  is blue in colour,  because the ligand (water) molecules facilitates  $d-d$ -transition. 
Anhydrous copper sulphate  $CuS{O}_4$  is colourless. In the absence of ligand (water) molecules, splitting of  $d-$ orbitals is not possible. Hence,  $d-d$  transition is not possible.  Hence, option (b) is correct.