Read the following context and choose the best option to answer the question.
Context: We both paused , our hearts racing not even daring to breathe incase they heard us . Then we heard them start to whisper again and we knew they would n't check into the noise further as I let out a silent sigh of relief . I felt Pete gently tug at my shirt , and as I turned to look at him he pointed towards the back of the shed and motioned for me to follow him .
Question: What is the reason that their whispering indicates they wo n't bother to check into the noise further ?
Options: 
- If they are whispering or talking it means they are n't listening to us , they listen to each other .
 - None of the above choices .
 - When people whisper it means they are certain they are alone .
 - They are so quiet that we can hear everything around us .


If they are whispering or talking it means they are n't listening to us , they listen to each other .