Indicate the one choice below that does not argue for subduction as a cause for volcanos in the cascade mountains: select one: a. volcanos occur in a chain or arc parallel to the subduction zone b. erupted lava is intermediate in composition because mafic asthenosphere and silicic continental crust are both melted here c. shallow earthquakes occur along this plate boundary d. lavas include elements from marine organisms, presumably drug into the subduction zone along with the oceanic sediments to great depths e. the deepest earthquakes known happen to occur along this plate boundary