Scientists believe that the earth's orbit gradually changes from being elliptical to being nearly circular and then back to elliptical in a period of about 100,000 years. this causes global climatic change. the more elliptical the earth's orbit, the greater the difference in (2 points)

a magnetic force on the earth's closest and farthest locations from the sun

b gravitational pull on the earth's closest and farthest locations from the sun

c solar energy received at the earth's closest and farthest locations from the sun

d duration of days and nights at the earth's closest and farthest locations from the sun