Parts of a sentence are given below in jumbled order. Arrange the parts in the correct order to form a meaningful sentence.

P) once said

Q) a wise man

R) that action speaks

S) louder than words

To arrange the given jumbled parts into a meaningful sentence, let us analyze the role of each part:

1. Q) a wise man: This acts as the subject of the sentence.
2. P) once said: This is the verb phrase that naturally follows the subject to introduce a quote or statement.
3. R) that action speaks: This starts the noun clause that represents what the wise man said.
4. S) louder than words: This completes the well-known idiomatic expression "actions speak louder than words".

Combining these parts in the order of Q → P → R → S forms the grammatically correct and coherent sentence: "A wise man once said that action speaks louder than words."

Therefore, the correct sequence is QPRS.