Questions 11-13 are based on the following passage about a science project. You now have 15 seconds to read the questions 11-13. Which of the following statements is TRUE

A．Sound travels faster through cold water than warm water.
B．By transmitting sound waves, the scientists will be able to determine if our planet is warming up.
C．If sea animals are distressed by the sounds, they would swim away from the speaker.
D．There are signs that the animals are being harmed.