The put-call parity makes sure that all else remaining equal, an increase in the value of a call option will be accompanies by an increase in the value of the corresponding put option.
Simply stated, the put-call parity can be expressed as:
Value of call - Value of put = Spot price - Exercise price discounted to the present
The two terms on the right hand side of this equation are fixed. Therefore, for the equality to be maintained, any increase in the value of the call option on the left hand side has to be accompanied by the value of the put.
Choice 'c' is therefore the correct answer.
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