What is the structure of the sentence?

if you want a pet, hamsters are perfect unless you have allergies.

a. simple
b. compound
c. compound-complex
d. complex

Which of the following is true of theme? a. theme is what readers learn from the character's experiences. b. there is only ever one theme in a story or poem. c. there is usually no hint of a story's theme until the climax. d. theme is developed only through dialogue.