<span>The sentence which is a relevant supporting detail in a personal narrative about how you learned how to ride a horse is: </span> c. how you held onto the saddle horn at first because you were so nervous
The usual feeling being a first-timer is nervousness which is evident in this sentence. When you happen to learn how to ride a horse you would certainly find ways not to fall down so you need a stable part of the saddle to hold onto.
