The answer is d, strata formation. because the earth's ground, even under water, is always shifting, after some time, rock formations can occur. it can sink, create sink holes, crack apart, and residual rock & earth can form new strata.
C. Coral Reefs, The Great Barrier Reef actually.
One is directly above the Gulf Stream and one is a little bit further above and to the right of the first one.
Hope this helps :)
It would actually be Graph C since a proportional relationship also answers the question of determining the unit rate, slope of the line, and etc.
The unit rate is 5/1, and follows the rate into a slope making it proportional.
Hope I helped! ^-^
