Repetition usually tells us that the someone wants a large emphasis on this word: that it has a significant meaning to them, and/or possibly the whole tale itself.
In the text it says, "She taught me my scales and exercises, too, on the little parlor organ", "I struggled with the 'Harmonious Blacksmith'", and "<span>I had been doggedly beating out some easy passages from an old score of 'Euryanthe'". The boy mostly practiced scales and exercises, but he also played "Harmonius Blacksmith" and "Euryanthe".</span>
The most likely answer would be C if the topic is toddlers.
HOWEVER if their is no information to support that it is about toddlers in your marital then it is most likely D.
