All the planets orbit the sun ina: in nearly circular orbitb: at the same speedc: in perfect circlesd: in triangular orbits

Can someone me with this plz? ! i'm putting 20 points on it!

Dubai is challenged by all of the following environmental factors except a. a warm and dry climate b. a lack of annual rainfall c. scarce freshwater resources d. a lack of valuable natural resources

Which of the following mountain ranges is home to the largest mountain peak in europe? a. the carpathian mountains b. the caucasus mountains c. the balkan mountains d. the ural mountains select the best answer from the choices provided a b c d