Hey lheiannie07 and Vincen,

Anytime we see a partially underlined list, we should jump to parallelism right away. Let's look at the grammatical structure of the original sentence:

• beginning with his Red period

• continuing through his blue period

• finishing with his period of Cubism

We see that the structure is almost the same between the three list items (-ing verb, preposition, "his", descriptor, "period") but that the third item switches our order up just a bit - if it said "Cubist period" instead, it would match the structure of the other two. This is exactly what B does, so B is correct.

C specifically is wrong because it does the third list item does not include the -ing verb or the preposition used in the other two list items, breaking the parallelism:

• beginning with his Red period

• continuing through his blue period

• his Cubist period

Let me know if you'd like answer choices D and E explained as well!

Any time! Glad the explanation helped.