the synonym

[thanhthanh.esl]

please help me!
In the following sentence, which word could be best replaced for the expression " centered on " : "encircled" ; "located on" , focused on" or "surruounded" ?
"Criticsm of the program centered on what was preceived "

[Soup]

Hi thanhthanh.esl


Criticism of the program centered on what was perceived.


a) encircled
b) located on
c) focused on
d) surrounded