Read the passage

advertiement posted on the school bulletin board:

kelly's boarding and pet camp is looking for student "pet camp counselors" for our busy season, june through august. applicants should be at least 16-years-old, have their own transportation, and love pets. our counselors are responsible for feeding and cleaning-up after campers, going on long walks with dogs, and having play sessions with cats. counselors can work between 15 and 20 hours per week and can make up to $8/hr. e-mail [email  protected] with your name, phone number, experience, and references so that we may contact you. no phone calls to us, .

why would june through august be a busy time for kelly's business?
a) pets need more care in the summer than they do in the winter.
b) pets will need to be cared for when their owners go on vacation.
c) kelly accepts more clients since she can hire students over the summer.
d) pets like to go to camp when their owners are home during summer vacation.