Let's look at both questions one by one:

**Question 16:**

The topic here seems to be about the benefits of raising children in the countryside versus the city. The correct order should logically present the advantages of the countryside before addressing the city.

The best choice is: **C. e - d - b - c - a**

- e. Some individuals believe that raising children in the country is an ideal option. (Introduction)
- d. Firstly, the countryside allows children to be in touch with nature, taking care of animals and helping with gardening. (First advantage)
- b. Additionally, they are able to play outside without being concerned about their safety as when they are in the city, where they are kept inside and driven towards using smartphones and computers. (Second advantage)
- c. As a result, children can learn to protect the environment and live without modern conveniences. (Result of countryside living)
- a. On the contrary, schools in the city typically offer lower-quality education and it can be challenging to find extracurricular activities. (Contrasting point about city schools)

---

**Question 17:**

For this question, the sentences need to flow logically from an introduction about social media to discussing its benefits.

The best choice is: **C. a - f - b - c - d - e**

- a. Dear John, when we look at the positive aspect of social media, we find numerous advantages. (Introduction)
- f. Students can educate themselves on various topics using social media. (First advantage of social media)
- b. Firstly, it is a great device for education. (Transition to another advantage)
- c. Moreover, live lectures are now possible because of social media, so you can attend a lecture happening in America while sitting in India. (Specific example of how social media helps education)
- d. Most importantly, it also provides a great platform for young budding artists to showcase their talent for free. (Another significant advantage)
- e. Best wishes. (Closing)

So, the final answers are:
- **Question 16: C**
- **Question 17: C**