Triangle abc is congruent to triangle . which sequence of transformations could have been used to transform triangle abc to produce triangle ? a. triangle abc was translated 10 units right and then reflected across the x-axis. b. triangle abc was reflected across the y-axis and then translated 7 units down. c. triangle abc was reflected across the x-axis and then translated 9 units right. d. triangle abc was translated 7 units down and then 9 units right.