When did the ‘human line’ diverge from primates? What evidence supports this?

[From livescience.com] "A new study of genes in humans and chimpanzees pins down with greater accuracy when the two species split from one. The evolutionary divergence occurred between 5 million and 7 million years ago, an estimate that improves on the previous range of 3 million to 13 million years in the past."

answer; ///i believe that the correct answer is (d); ///