The CEO attributed the relative success of Framingham Corporation to both their traditional values and to the CFO's innovative reorganization of the divisional income scheme.
Understanding the meaning and Pre thinking the possible outcome-
The CEO attributed the relative success of Framingham Co. to -
1) Framingham Co.'s traditional values
2) Framingham Co.'s CFO's innovative reorganization of the divisional income scheme.

(A) to both their traditional values and to
WRONG Framingham Corporation is an organisation hence a singular noun and use of their should be replaced by a singular pronoun

(B) to both its traditional values and
CORRECT this one fixes the pronoun error and also the parallelism error

(C) both to its traditional values and
WRONG this one corrects the pronoun error but has got parallelism error- to its traditional values is not parallel to the CFO's innovative reorganization of the divisional income scheme

(D) both to their traditional values and
WRONG same error as (A)

(E) both to their traditional values and to
WRONG same error as (A) and (C)