We rigged it up so that it works again , but it 's no longer a textbook SPL system . We 're going to keep up the meds for another week , but reduce her Banamine from 500 # twice a day to 500 # once a day . Rosie did not act like a lady for Megan today .
According to the above context, choose the best option to answer the following question.
Question: What may be the reason why they needed to adjust the medicine ?
Options:
A. They could n't afford it anymore .
B. They wanted to see if she did n't need it anymore .
C. They want to try a natural approach .
D. It was no longer working .


D