A

When a tuning fork vibrates, it creates compressions and rarefactions in the surrounding medium (usually air). In a longitudinal wave, the displacement of the medium is in the same direction as the direction of wave propagation, which is characteristic of sound waves. Therefore, the waves produced by a vibrating tuning fork are longitudinal waves.
Step 1: Understand the nature of sound waves. Sound travels as longitudinal waves, where particles of the medium oscillate back and forth in the direction of the wave propagation.
Step 2: Since a tuning fork generates sound through vibrations, the waves emitted are indeed longitudinal.
Conclusion: Thus, the correct answer is Option A: Longitudinal.