Billie previously learned the multiplication tables through repeated practice and then, when faced with the new problem of estimating the cost of 6 boxes of cereal, applied multiplication to solve the problem. The most accurate description of what she has done is .

- Higher Order Thinking.

Explanation:

'Higher Order Thinking' is described as the thinking process that lays emphasis on learning and memorizing beyond the factual information and recapitulating stories that assist in developing critical and analytical skills.

As per the question, Billie's learning process best exemplifies 'higher-order thinking' as she focuses on learning through 'practice' that enabled her to memorize the information more effectively as she was able to apply the tables successfully to solve the multiplication problem. This reflects that she has moved beyond 'rote' learning and learned the tables critically and analytically which enabled her to use the information constructively for future purposes. Thus, 'higher-order thinking' is the correct answer.

i am pretty sure it is d.