Brittani is solving the addition problem 4 + 5. She says, "If I have one, two, three, four fingers plus one, two, three, four, five fingers, that equals...one, two, three, four, five, six, seven, eight, nine! Nine fingers!" Brittani is using: Question 21 options: a) nonconceptual speech. b) verbal thought. c) assimilation. d) self-directed speech