Read the following context and choose the best option to answer the question.
Context: She felt like giving him an even harder kick , but her horse stayed stubbornly a few strides behind his no matter how she slapped its sides . " Do n't tell me to shut up ! You know what you said ! " He rolled his shoulders .
Question: What may be the reason the horse was so stubborn ?
Options: 
A. The horse had not yet been properly trained .
B. The horse would only behave when asked nicely .
C. The horse behaves badly when not kicked hard .
D. The horse only likes when babies ride his back .


A