Step 1: Read the Original Sentence Carefully, Looking for Errors The original sentence contains a list, so your Pattern Recognition skills should tell you to check for parallel structure. Because the first two items in the list contain “Red period” and “Blue period,” you should expect the third item in the list to follow the adjective-noun pattern and contain “Cubist period.” Instead, this sentence ends with “period of Cubism,” breaking the pattern and making choice (A) incorrect. Step 2: Scan and Group the Answer Choices Choices (B) and (C) end with “his Cubist period,” while (A) and (E) reference “his period of Cubism” and (D) ends with the similar construction “his phase of Cubism.” You have a 3-2 split.