I cannot see (g). Is there supposed to be a second image? What do you know about the geometry of the transition state for a typical E2 process? Is there a special rule?
(G) is a 3-bromo-3-methylpentane reacted with t-buOK. In this case, I understand that the major product should be the less substituted alkene due to the sterically hindered base. I think I may figure out why (d) only has regioselectivity, it's because if you drew either the cis and trans isomer for (d), they are identical