Question

review the details below.
dr. carl sagan was the co - host and co - writer of cosmos: a personal voyage, a thirteen - part pbs series watched by 750 million people.
dr. carl sagan wrote a highly popular companion book for the series cosmos, as well as the follow - up book pale blue dot: a vision of the human future in space.
as an astronomy and space sciences professor at cornell university, dr. carl sagan edited a scientific journal, published books, and appeared frequently as a guest on late - night talk shows.
choose the best topic sentence to introduce a paragraph containing these details.
dr. carl sagan was a gifted communicator who used his vast knowledge to share scientific topics with millions of people.
dr. carl sagan used his credibility as an academic to co - host and co - write cosmos: a personal voyage.
tv series and books designed for the average person are the best ways to get the public interested in scientific topics.

Explanation:

The details cover Dr. Sagan's popular TV series, companion/follow-up books, academic work, and media appearances—all centered on his ability to share science with large audiences. The first option encapsulates all these points, while the second only focuses on Cosmos and the third is a general statement not about Sagan.

Answer:

Dr. Carl Sagan was a gifted communicator who used his vast knowledge to share scientific topics with millions of people.