Please Read the Clinical Scenario, and Then Answer the Question

Please read the clinical scenario, and then answer the question that follow to become familiar with the traditional NCLEX question format.
A mother brings in her unimmunized, otherwise healthy, 7-year-old daughter to the pediatric office where you are the charge nurse. The child has nearly 100 lesions all over her body, mainly localized to her trunk. Most of the lesions are vesicular, but a few have scabbed over. According to the mother, her daughter broke out in this rash about 5 days ago. She never experienced a fever, but the rash seems to be incurably itchy. As the mother is telling you this, you see her daughter itch open one of the vesicles, revealing a clear fluid.
-You discover the child shares a bedroom with her 12-year-old sister,who has not had chickenpox and has not been vaccinated against it either.She is supposed to go to summer camp in 1 week.The mother wants to know if it is safe to let her go to camp.How will you best respond to her question?

A) "Yes,it is safe for her to go.Since chickenpox has an incubation period of 3-5 days,she would have exhibited symptoms of the disease already if she had contracted it."
B) "Yes,it is safe for her to go.Chickenpox is rarely contracted by children older than 10 years of age."
C) "No,it is not safe for her to go.Since chickenpox has an incubation period of 10-20 days,she could begin exhibiting symptoms at camp."
D) "No,it is not safe for her to go.Since she was exposed to her sister,she will be contagious to other kids at camp but will probably not exhibit symptoms."