I believe the correct answer is the third one.
Hello ;)!
The answer according to your attached pdf is uploaded here in my answer as image. Please check.
While Will thinks he already knows what's inside , we do not. ... Just like Will thought, it's the carnival mask that his brother Stephen gave him .
<span>In Christmas day, Will opens first his present from Stephen and finds a strange carnival head with a story that an Old One told Stephen to send it </span>
Answer:
i think it's "I have found some proof that dragons may have existed."