Which observation about the Mid-Atlantic Ridge region provides the best evidence that the seafloor has been spreading for millions of years? A. The bedrock of the ridge and nearby seafloor is igneous rock.
B. The ridge is the location of irregular volcanic eruptions.
C. Several faults cut across the ridge and nearby seafloor.
D. Seafloor bedrock is younger near the ridge and older farther away.

the correct answers are:

a - pacific plate;

it is the biggest oceanic tectonic plate. surrounded on all sides by continental tectonic plates, it is submerging and gradually becoming smaller and smaller.

b - north american plate;

huge continental plate, occupying big portion of the northern hemisphere.

c -eurasian plate;

alongside the north american plate, it is one of the two dominant continental plates in the northern hemisphere.

d - indian plate;

a small continental plate, that has been part of gondwanaland initially, but after the break up of it, moved towards northeast and pushed into the eurasian plate that was once part of laurasia.