what is the source of the magma that fuels the island arc complex?

a. continental crust
b. the subducted plate
c. the overrriding plate
d. the volcanoes that make up the complex

2 answers

I'm pretty sure that its B

(wont let me post link but search island arcs on google then go to the wikipedia page)
what is the source of the magma that fuels the island arc complex?