look to is a phrasal verb which has the following meanings:
1.
(look to someone) to hope or expect to get help, advice etc from someonelook to someone for something: As young children, we looked to our parents for guidance.
look to someone to do something: They’re looking to me to help improve sales figures.
2.
(look to something) to direct your thoughts or attention to somethingThe party needs to look to the future and forget its past problems.
A. looked to the past campaigns of their counterparts
No requirement of past tense as the sentence is expressing a general truth and general truths are expressed with simple present tenseB. looked to past counterparts’ campaigns
No requirement of past tense as the sentence is expressing a general truth and general truths are expressed with simple present tenseD. are looking to counterparts’ past campaigns
No requirement of present continuous tense as the sentence is expressing a general truth and general truths are expressed with simple present tenseC. look to the past campaigns of their counterparts
E. look to their counterparts’ campaigns of the past
past campaigns is better than the campaigns of the past. Therefore C in my opinion