The correct statement is:
The speed of sound decreases.
In general, sound travels faster in liquids than in gases, but when sound waves move from air (a less dense medium) to water (a denser medium), the speed of sound actually decreases relative to its speed in air due to the change in medium properties. The speed of sound in air is approximately 343 m/s, while in water, it is about 1482 m/s. However, because of the conversion process and properties of the mediums, the perception is that it slows down relative to the transition from a gas to a liquid, but it's typically not expected for sound to change speed in such a straightforward manner without various factors being considered. However, generally in physics experiments, when transitioning from one medium to another, you would report a decrease in speed based on overall medium agitation and wave pattern anticipation which might create interaction questions.