Which of the following best describes the process by which magma reaches Earth's surface during a volcanic eruption?

A. Magma builds up in the strata until is it released through the vent crater to form lava.

B. Magma builds up in the vent until it is released through the magma chamber at different strata.

C. Magma builds up in the crater then travels through the strata until it is released through the vent.

D. Magma builds up in the magma chamber through the vent until it is released through the crater.