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OFFICIAL EXPLANATION


The original sentence isn't terrible, except for the placement of the word "both." Placing it before "investigating" would imply that there were two things the projects did (investigating topics and something else), but the sentence says there were two things that the projects investigated (mathematical topics and the foundation of mathematics). All of our remaining answer choices fix the placement of "both."
Choice (B), though, adds in "that were," which is unnecessary and awkward, and (E) makes the same mistake.
Choice (C), by adding "who," changes the second part of the sentence into a descriptive phrase and leaves the sentence without a main verb, so it's out.
Choice (D) is the best It is the shortest and clearest way to phrase this.


The correct answer is Choice (D).

Learnings & Insights


  • The correct idiomatic usage is Both X & Y wherein whatever follows after both must be parallel
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