Answer - B.
Presetting one flip-flop and clearing all the other flip-flops is the correct way to start a ring shift counter.
Solution
A detailed solution to the question, to operate correctly starting a ring shift counter, requires provided here.
A common use of the Shift register is as a ring counter. The shift counter and the ring counter are nearly identical. The only difference is that, in the case of the ring counter, the input of the first flip-flop is now connected with the output of the last flip-flop.
The ORI used are Preset (PR) and Clear (CLR). PR and CLR both are active low signals. When PR equals 0, the result is 1. Additionally, the output is 0 when CLR is 0.
The working of this ring counter is as follows: -
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