Definition: Given a math problem with context and a question and 5 answer choices, the task is to provide the correct answer choice based on the problem. You must choose one of the given answer choices by letter: a, b, c, d, or e; anything else is invalid.
Input: Problem: it is the new year and mandy has made a resolution to lose weight this year. she plans to exercise and do yoga. for exercise she plans to workout at the gym and ride her bicycle in the ratio of 2: 3 everyday. she will also do yoga in the ratio, yoga: exercise = 2: 3. if she rides her bike for 18 minutes, how much time will she spend doing yoga ? ( rounded to minutes )
Options: a. 30 min., b. 41 min., c. 17 min., d. 23 min., e. 25 min.
Output:
a