2. 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."Arelated 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."