The approximate age of a star cluster where the brightest main sequence stars are G stars is 10 billion years. Generally, it takes tons of time for stars to evolve. It is also assumed that stars in a cluster are homogenous or have properties that are similar to one another. The amount of time the star remain in its stage or sequence phase is determined through its mass.
Volcanoes occur at underwater subduction zones. In fact, volcanoes form at most if not all types of subduction zones. Subduction zones are regions where tectonic plates collide and one plate bends and slides underneath the other plate. This bent plate reaches the mantle of the Earth, putting more pressure on the hot materials inside it.
I can see you have a big heart inside.
I know A is correct, and I think the other option is C, but I'm not 100% sure