Jamal Was Having His Hearing Tested,and a Number of the Tones

Jamal was having his hearing tested,and a number of the tones that were presented were so faint he was not able to detect them.What can you say about the faint sounds

A)  They are below Jamal's absolute threshold for sound. 
B)  They cannot create a just noticeable difference. 
C)  They cause weak action potentials. 
D)  They fall below Jamal's adaptation level for sound.