Explanation:

- Sound travels at different speeds depending on the medium due to differences in molecular density and elasticity.

- Option 1: Much faster

- Sound travels faster in water than in air because water molecules are more densely packed than air molecules, facilitating quicker vibration transmission.

- Correct, sound travels approximately 4 times faster in water than in air.

- Option 2: Much slower

- This is incorrect. Sound does not travel slower in water than in air due to water's higher density.

- Option 3: At no difference

- This is incorrect. There is a significant speed difference due to the properties of the two media.

- Option 4: None of these

- This is incorrect because the correct answer is among the given options.