Explanation:

Let's break down the jumbled sentence:

- P: Scientists have discovered...

- R: Unique oil-eating bacteria in the Mariana Trench, the...

- S: Deepest part of the earth's oceans, a finding...

- Q: That may pave the way for sustainable ways to clean up oil spills...

Now, let's analyze the options:

- Option 1: PRQS

- It places "scientists have discovered" before "unique oil-eating bacteria" and ends with "that may pave the way for sustainable ways to clean up oil spills." It flows logically and makes grammatical sense.

- Option 2: QPRS

- This starts with "that may pave the way," which doesn't logically follow as the opening. It doesn't make a coherent sentence.

- Option 3: PRSQ

- It forms a sentence but disrupts the logical narrative, not fully covering the sequence where the bacteria is before mentioning the location.

- Option 4: QRPS

- Starts with "that may pave the way," which can't be the start of a complete thought. It doesn't form a coherent sentence.

Correct Answer: Option 1 (PRQS)