This question has Statement $1$ and Statement $2$. Of the four choices given after the Statements,choose the one that best describes the two Statements.
Statement $1$: Bats emitting ultrasonic waves can detect the location of a prey by hearing the waves reflected from it.
Statement $2$: When the source and the detector are moving,the frequency of reflected waves is changed.

• A
  Statement $1$ is false,Statement $2$ is true.
• B
  Statement $1$ is true,Statement $2$ is false.
• C
  Statement $1$ is true,Statement $2$ is true,Statement $2$ is not the correct explanation of Statement $1$.
• D
  Statement $1$ is true,Statement $2$ is true,Statement $2$ is the correct explanation of Statement $1$.