Read the excerpt from the story Hayden and Henry Go to Camp: As hard as he was trying to maintain the sullen, first-day-of camp attitude he had perfected over the years, Hayden couldn't help but be intrigued. He had always loved to pretend he was Robin Hood, Prince of Thieves, stealing from the rich and giving to the poor. Hayden had begged his parents for a bow and arrow on each of his and Henry's birthdays for the last few years but had always been told he was too young, and it was too dangerous.

"Hayden must be allowed to try archery if the camp is running the activity, right?" Henry asked his parents pleadingly.

"I guess it would be alright," their mother said with a smile. It was music to Hayden's ears.

That summer was the best of both boys' lives. Using a bow and arrow was everything Hayden had dreamed it would be. On the archery field, he felt strong and confident. He excelled at the sport and won every competition. Many of the other boys were in awe of Hayden's skill with a bow, and this gave him even more confidence. He decided to give some of the other activities a go, and found that he really enjoyed lacrosse, trampolining, and even hip-hop dancing!

On the final day of camp, Henry and Hayden were jointly awarded Camper of the Month awards during the parents' assembly. Their parents were full of pride.

"Ever thought of applying to be junior camp counselors next year, boys?" their dad asked, ruffling both boys' curls as they walked toward the car. Hayden and Henry looked at each other, their eyes dancing as identical cheeky smiles lit up their faces.

What does the phrase it was music to Hayden's ears mean, as it is used in the excerpt?

a. He was angry to hear the answer.
b. He was embarrassed to hear the answer.
c. He was happy to hear the answer.
d. He was worried to hear the answer.