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Can somebody please clarify why C is incorrect?
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Since our parallel marker is either/or, the part after each marker must match. If we want to use infinitives (to disable, to install), we have two choices:

1) to EITHER disable OR install
2) EITHER to disable OR to install

C mixes and matches those. It puts "to" in front of either, where it should apply to both verbs "to (disable or install)," but then uses "to install" as well. That would give us "to to install."
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