Read the following statements and re-arrange them into a meaningful sentence.

The statement
(P) therefore you must listen carefully
(Q) what the speaker has said
(R) in order to understand
(S) will be made just once

SPRQ

The correct answer is option 3. SPRQ.

Let us break down the arrangement "SPRQ":

S: This begins the sentence by stating that the statement will be made just once, setting the context for the necessity of attention.

P: Followed by "S," this asserts the consequence of the statement being made only once - it implies that careful listening is essential.

R: Next, we have "R," which clarifies the purpose of listening carefully - it's to understand what the speaker has said.

Q: Finally, "Q" concludes the sentence by specifying what exactly needs to be understood - the content of what the speaker has said.

So, when arranged as "SPRQ," the sentence flows logically from setting the context to explaining the necessity of careful listening and concluding with the specific aim of understanding the speaker's words.