Im assuming that the correct answer is
D) "But ideas did not come that day and three o'clock in the morning found me weary and with an aching head tossing about in my bed."
"During the shop’s peak hours – from eight in the evening till around midnight – one could hardly hear oneself talk because of the boisterous chatters that went on."
Do provide a better description of the horse
The previous storyline would most likely fit into the genre romance and mystery.