The chosen answers for each sentence are:
* D. due to
* A. agree
* C. most
* B. much
Here's a breakdown of why these are the best choices:
* Privacy is a Concern in the digital age.... the risk of cybercrime.
* Due to is the most appropriate connector here because it indicates a cause-and-effect relationship. The digital age has brought about privacy concerns due to the increased risk of cybercrime.
* Despite and but could also be used, but they suggest a contrast rather than a direct cause. So that wouldn't be suitable as it implies a purpose.
* City dwellers....... that a smart city with computer côn Trolled system can make life easier.
* Agree is the most natural verb tense in this context. It indicates a present belief or opinion.
* Agreed suggests a past agreement, perhaps after a discussion. Have agreed is grammatically correct but a bit clunky.
* The urban Centre of the city is the busiest and.... crowded area.
* Most is the superlative adjective that indicates the greatest degree of something. The urban center is the most crowded area compared to other areas in the city.
* Least is the opposite of most and wouldn't make sense. Much is a comparative adjective and wouldn't be used for the strongest comparison.
* B. much is the most fitting choice here. It emphasizes the significant degree of crowdedness.