A Homeschooled Child Recently Visited an Ailing Great- Grandparent Who

A homeschooled child recently visited an ailing great- grandparent who was complaining of a painful rash. Even though the child had had no contact with children suffering from chickenpox, the child developed chickenpox. How did the child contract the infection?

A) An insect vector infected the child.
B) The virus was likely contracted from fomites.
C) The adult had shingles and the child was exposed to virus particles.
D) The adult had chickenpox and exposed the child.
E) There is insufficient information for a conclusion.