Which type of lava is most likely to erupt at plate tectonic setting 'b'?

Can't find the 'b' in google but I know that if it is a continental setting like the western side of North and South America it would most likely be the volcanic rock andesite (could be some rhyolites and dacites too) whereas if it was an oceanic island setting like Hawaii it would most likely be basalt.

Answerepicenter;

Answer accretion;