The equation you need to use is

where Q is the charge in C, I is the current in Amps and T is the time in seconds.
So we have T = 60s
I =

A
let's work out Q

C
this is the total charge passing a point in a minute so divide by the charge of one electron (

) to find the number of electrons passing the point in a minute which equals
Given what we know about volcanic formations, we can conclude that the Mt. St. Helens volcano was formed by the process described in option D, "Subduction an oceanic continental convergent boundary caused a mountain range to form and magma to come to the surface".
Mt. St. Helens is a volcano that falls under the category of a stratovolcano. Stratovolcanoes are volcanoes that commonly form at subduction zones. This process forms chains or clusters of mountains along the boundaries of tectonic plates, where oceanic crust is pulled under another type of crust. This process tends to form mountain ranges which contain volcanoes, such as:
- Cascade Range (To which Mt. St. Helens belongs)
- Los Andes
- Rocky Mountains
- Campania Mountain range
and so on.
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Inertia is a property of all the objects. Galileo stated that inertia is proportional to mass. Therefore, the answer is D.