Question biggest/largest/greatest problem

[hirashin]

Dear native English speakers,
which adjective would sound right for the blank?
Your __________ problem is that you lack confidence.
(a) biggest (b) largest (c) greatest

Thanks in advance.

Hirashin

 

[mdchachi]

(a) sounds the most natural to me.

 

[hirashin]

Thanks, mdchachi.