The correct answer is B. a-b-e-c-d.

Here’s the reasoning:

• a. Firstly, smart technologies make people's lives easier by reducing household chores.: This is a good introductory point about the benefits of smart technologies in people's daily lives.

• b. There are some good things of living in a smart city.: This follows as a general statement about the advantages of smart cities.

• e. Secondly, the city infrastructure which includes sensors and cameras collects information about people and their activities, and uses it to provide faster, cheaper, and better services.: This gives more specific information about how the smart city operates.

• c. Besides, smart technologies help the city operate more efficiently.: This builds on the previous point, showing the benefits of efficiency in the city.

• d. Finally, the negative impact on the environment is less.: This wraps up the argument by highlighting the positive environmental impact.

Thus, the sequence flows logically as a-b-e-c-d.