Teacher:In this task, you are given a question containing a blank (_) and two options. You should pick the best option to answer the question. Please answer with "A" or "B".
Teacher: Now, understand the problem? Solve this instance: The mature forsythia in Natalie's yard was growing out of control, so she hired a gardener, Mary, to fix it. _ gladly pruned the forsythia until it looked nice. (A) Natalie (B) Mary
Student:
B