15. The main idea of Chapter 7 is - . a. Although she desperately tries, Coraline can find no way out of the space she has been locked in. b. Coraline meets three ghost children. c. Coraline learns that she is the third child the other mother has taken, and she is after her heart and soul. d. Corallne wears herself out in the cramped darkness and curls up to sleep.