The correct answer is "Consequently"
Step-by-step explanation:
"Consequently" is a linking word used to show consequences or effects. In the case of the paragraph presented, this is used to show the action " her teacher took her test, put a big red zero across the top..." was a consequence or effect of "her looking at her neighbor's test". Additionally, the use of this linking word shows the text has a cause and effect because the author is explaining the effects of cheating and by using this linking word the author explicitly shows one action was the effect of another.