I chose B over the OA.
The reason for the answer to be wrong is that B uses passive voice.
I have two questions about the reason:
1. The remaining sentence following the underlined portion says "...crossbreeding is said to provide...", which I think, is not parallel with the OA. Isn't "is said" passive? It would have been parallel if the construction were "...crossbreeding provides...". Still there is something missing.
2. How would cattle breeders acquire hybrid characteristics in their cattle? It is the cattle that has to acquire, right?
Please explain!
![Image](https://s28.postimg.cc/enk7y4tg9/unnamed.jpg)