Official explanation from Veritas
This problem is designed in part to "hide the proper decision point," a testmaker device via which there are obvious - but inconsequential - differences between answer choices (here the first words are verb tense differences and the last words are that vs. which differences, none of which provide an absolute distinction) to distract your focus from a less obvious, but very consequential, difference. Here the operative difference is related to subject-verb
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This problem is designed in part to "hide the proper decision point," a testmaker device via which there are obvious - but inconsequential - differences between answer choices (here the first words are verb tense differences and the last words are that vs. which differences, none of which provide an absolute distinction) to distract your focus from a less obvious, but very consequential, difference. Here the operative difference is related to subject-verb
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