Which explicit detail best supports the inference that Mina is good at math? Mina walked into class a few minutes late. Her group was struggling to find the answer to a problem. "Here, Mina," said Tom. "Can you figure this out?" Mina looked at the problem and made a few quick calculations. "Yes, think that's it," she said. She was right. A. She solves the problem quickly. B. Her group trusts that she will know how to solve the problem. O C. She arrives late to math class. O D. She had already learned how to solve the problem in a previous class. The answer is A.