8. The three-hinged arch ABC carries a uniformly distributed load from a horizontal deck as shown. The value of the horizontal thrust at the supports is what? (Show all of your work. No work, no credit.) (15pts) B 15 m 10 m a. 282 kN b. 197 kN c. 218 kN d. 252 kN 20 kN/m 不 4 m 6 m