Transitions link the two ideas together and relate one to each other. On the contrary, is the transition that should be added at the beginning of the fifth sentence.
What are transitions?
Transitions are the words and phrases that interlink and connect the two sentences to show the relationship between the two.
Some of the transitions that are used commonly are in addition, for example, in contrast, in conclusion, on the contrary, moreover, in fact, etc.
The sentence can use the transition 'on the contrary' as they are used to refute an argument.
Therefore, option A. on the contrary, should be used.
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