Meaning of 'you sound clear'

[ohnmar]

Test No. incompl/elem-25 "On my Mobile", question 4

You ......... very clear.

(a) sound
(b) ring
(c) hear
(d) noise

Test No. incompl/elem-25 "On my Mobile", answer 4

You sound very clear.

Correct answer: (a) sound

Your answer was: incorrect
You hear very clear.
_________________________

what the meaning of sound in here.
can i use hear also?

thanks
ohnmar

[Alan]

You sound clear means the line is good.
_________________
English as a Second Language
You can read my ESL story Present Simple

[Gundela]

Hi,

I'm very confused,Why b'coz, in the test part it showing my answer(sound) is correct,but in the explanation part is showing other word(hear) is correct.Kindly clarify my doubt.

please find the below context.

correct sentence:
You sound very clear.

Correct answer: (a) sound

Your answer was: correct

Translate sentence or define "sound"