Reading Comprehension (RC) | Re: The fact that superior service can generate a competitive

Could somebody explain Q3 Please.

Where in the heaven is it mentioned that "It enabled the bank to retain customers at an acceptable rate" ?? :/

Q3 :- The passage suggests which of the following about service provided by the regional bank prior to its investment in enhancing that service?

(A) It enabled the bank to retain customers at an acceptable rate
(B) It threatened to weaken the bank’s competitive position with respect to other regional banks
(C) It had already been improved