The structural layers of the sun are shown in the cross-sectional diagram. An image of six concentric circles is shown. The six layers thus formed are of varying thickness. The layers in order from inside out are labeled, A, B, C, D, E, F.

Which layer represents the corona?

C
D
E
F

The Corona is the outermost atmosphere of the sun, there is no picture so I can only guess that it's the 6th layer.  

I hope this helps!

f!

Explanation:

the corona is the outermost layer!

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .

if you answer my question i will answer yours