All are correct. To worry which is right and which is wrong is not a useful exercise. Instead, devote your efforts to learning about the differences in meaning, and the various circumstances in which you would choose to say it one way rather than the other.

This is a pointless exercise they are all equally correct. You have failed to point out what/which grammar construction you require to be selected. Which grammar construction you are hoping to teach. The whole exercise is badly thought out. It might have been a little more useful if you "HAD" asked which of the four A B C or D contains a word more commonly used in America than other English speaking countries. Answer Is D with the word "GOTTEN" , that dropped out of popular use by most other English speakers. but is easily understood and does not affect the other English speakers ability to understand.

A: Both are OK, but Left is usually preferable, because it matches "Katie told me" (which was not "Katie had told me", which would be unnecessarily verbose). Exception being, if you want to emphasise "had" as opposed to "had not" which someone else may have claimed - in such a rare case, Right would then be best. B Both are OK, about equal. C & D: Both are OK but Right is a bit clearer. If you change "in 2000" to "in the year 2000" to make it a bit clearer that you're talking about a year, and a past event, then Left becomes equal good.