Let us now try this topic in the structural way. . Obviously A and B are wrong since they substantially alter the menaing as if, both the action of creating confusion and will be continuing are happening temporally or synchronously; It may even mean, if as is used in replacement of because, this causal phenomenon is not intended.
Coming to C, D and E: All the three sentences are compound sentences using the conjunction ‘and’ and assuming intrusion as the subject for the second clause too for the sake of brevity. This should not take away the independentness of the both the clause
C—this looks fair enough, because the final sentence is going to be- The intrusion of politics into the modern Olympics - has created, and will no doubt continue to create, frustration for athletes and fans that would prefer to see the games represent only competition among the excellent from all nations. The clause can take the subject as ellipsis verbatim and make sense.
D: Now you can see the sentence’s deficiency. When we stop saying the intrusions has, we don’t know what it has. But the second part is okay with the clause taking the subject of the intrusion elliptically.
E. continue what is not clear, whether it is continue frustration or continue to frustrate. If we have to assume continue to create frustration, then it is wrong. Continue frustration is also not acceptable, because creating frustration is an integral part of the intended meaning. So E is inadequate