For the first answer I would say A but for the second one it is between A and E
D is the answer. There are many examples of how these horses can be both entertaining and extremely disciplined.
It's the best transition between the 2 sentences to connect them.
First missing word is have and second missing word is have
In this context, the first step is always to ask yourself what is the purpose of reading, which includes only to entertain, to learn about one topic, to expand vocabulary, etc. This is the first step because the purpose defines the types of texts you should read and limits the options.
Incomplete question, What is the answer to Part A ?