Read the following passage: after tracking down the correct pipe fittings, i approached my final obstacle - the self-checkout. that was, allegedly, the quickest way out of this labyrinth, but i knew i wouldn't escape without a struggle. i began with the spray paint because it had the largest bar code. beep! beep! charged twice for one item - the battle had begun! which words from the passage best create a combative tone toward the self-checkout? a. approached, begun b. tracking, charged c. final, escape d. obstacle, struggle