Volcano a Erupts Rocks with SiO₂ content Ranging from 49

Volcano A erupts rocks with SiO₂ content ranging from 49% to 52% whereas volcano B, 100km away, erupts materials with SiO₂ content of 62- 68%. Which statement best characterizes these two volcanoes?

A) Volcano A is likely to be a supervolcanoes with violent eruptions, whereas volcano B is probably a shield volcano with quiescent eruptions.
B) Both volcanoes are shield type volcanoes that are characterized by quiescent eruptions.
C) Both volcanoes are violent, explosive volcanoes that spread ash continent wide.
D) Volcano A is probably a shield volcano with typically quiescent eruptions, whereas Volcano B is likely a stratovolcano characterized by violent, explosive eruptions.