Answer :

The velocity of sound V is directly proportional to the square root of the temperature. So if the temperature increases the velocity of the sound also increases. Option C is correct.
Since the frequency of the sound producing tuning fork is constant hence the frequency of the sound will also be constant. Also,

Thus the wavelength will also increase if the temperature increases. Option A is correct.
Since frequency is constant, Time period will also be constant. So, option B and D are incorrect.

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