It creates a reassuring tone should be the correct answer.
Based on the question given, a paragraph about how I faced my greatest challenge is explained below:
The greatest challenge I have had till now was my challenge with Mathematics. While growing up, I was bad with Mathematics, I disliked anything that had to do with calculations. There was a particular day in school that our examination scripts were given back to us. I realized that I had the lowest score in Mathematics. I was sad and I told myself that I was going to work harder. I have improved tremendously now and I'm happy I tackled my challenge.
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Under (on) what condition
Giddy means dizzy in this excerpt as the characters rushed from bed to the windows.
Doth means does in this excerpt showing how the light they were seeing appear.
Amain means quickly as a train.