Astro 250 - Exam 3 Sample - MC answer key 1- b 10- c (but b is ok) 19- e 2- c 11- a 20- e 3- b 12- e 21- c 4- b 13- b 22- a 5- c 14- e (not in 2014) 23- a, d 6- c 15- d 24- e 7- d 16- b 25- c 8- 2 3 1 3 5 17- d 26- a 9- c 18- e 27- a