Answer:
B). Then the rebels will overcome the empire’s troops and take the city.
Step-by-step explanation:
The sentence that would be the best addition to conclude the paragraph is displayed in option B and i.e. 'Then the rebels will overcome the empire’s troops and take the city' as it appropriately corresponds to the last sentence of the given paragraph that is written in simple future. This is the most perfectly offers an end to the paragraph, both grammatically and comprehensively. Thus, option B is the correct answer as the other options are grammatically incorrect. Option A wrongly employs overcame with take that doesn't offer parallelism and at the same not corresponding to the sentence prior to it. Option C and D also carries the similar error of not continuing the time of the previous sentence.