60 thyrsistors are connected in series and parallel to form a 10 KV and 5.5 KA switch. Each thyristor is rated for 1.2 KV, 1 KA. The no. of parallel path are 6. The efficiency of the switch is______________________?

• A. 76.3 %
• B. 91.6 %
• C. 83.3 %
• D. 90.9 %