PART B: Which detail from the text best supports the answer to Part A?
A. “A century ago, after five months and more than 9,000 experiments, famed inventor Thomas Edison still wasn’t able to make a new type of storage battery work, according to a 1910 authorized biography.” (Paragraph 5)
B. “‘If you’re engaged in a hard problem, you’re developing an attitude that failure is okay,’ says Walker. ‘Accepting failure helps you learn’” (Paragraph 9)
C. “As Walker suggests, the technique often goes hand-in-hand with inquiry-based learning. Students often teach and mentor one another.” (Paragraph 14)
D. “A related approach is also seeping into K-12 math education. Common Core is a set of educational standards that 43 states and the District of Columbia have adopted.” (Paragraph 20)