Answer :
2. She was pleased by the girl's enthusiasm
While telling Da-duh about New York the narrator showed her that she could dance by dancing the truck - a dance popular in the thirties. After this she showed her that she could sing by singing 'I’m Gonna Sit Right Down and Write Myself a Letter', 'Tea for Two' and some other songs. Da-duh was somehow pleased with girl's enthusiasm and gave her a penny to go buy herself a sweet from the sweet shop up the road.
The protagonist is the main/leading character and the antagonist s usually a character or a group of characters that oppose the story's main character, who is known as the protagonist.
According to this, the answer is A.
The second one is the best answer