Explanation:

- D. TV has become a powerful medium these days.

- This sentence introduces the topic of television and its increasing influence.

- B. Older people and children remain glued to it.

- This sentence provides more detail about the audiences who are captivated by TV.

- C. It has become a great source of entertainment for all.

- This sentence elaborates on why various audiences are attracted to TV, mentioning its entertainment value.

- A. It is also a rich source of news updates around the world.

- This sentence adds another aspect of why TV is influential: its ability to provide global news.

- Option 1: DBCA

- This sequence starts by establishing TV's significance, followed by who watches it, its entertainment role, and finally, its informative aspect.

- This order logically builds from the general influence of TV to specific functions.

- Option 2: ACBD

- This begins with TV as a news source, which is informative but doesn't initially highlight its overall impact.

- Option 3: ABCD

- This option seems fragmented, starting with news and then discussing audiences; it doesn't build logically.

- Option 4: BDCA

- This starts with the audience and closes with general statements, leading to possible confusion about the overall focus.

Option 1: DBCA is indeed the best arrangement for a coherent paragraph.