Explanation:

Certainly, let's look at the provided sequence:

- S1: Space exploration has always been a topic of intrigue.

- P: It leads to technological innovations on Earth.

- Q: The benefits go beyond just scientific discoveries.

- R: The pursuit of space exploration requires massive investments.

- S: The knowledge we gain can improve our understanding of the universe.

- S6: Nevertheless, the curiosity about our universe keeps driving us forward.

Now, let's try to arrange these sentences logically:

- P follows S1 well as it states the tangible benefits of space exploration.

- Q logically follows P by expanding on the broader benefits.

- S comes next, emphasizing concrete gains from exploration.

- R logically precedes S6 because S6 mentions the driving force which can be seen as a justification for the investment mentioned in R.

Correct sequence: P-Q-S-R

Option 3 (c): P-Q-S-R

- Your sequence is correct.