In the following items, some parts of the sentence have been jumbled up. You are required to rearrange these parts which are labelled $P, Q, R$ and $S$ to produce the correct sentence. Choose the proper sequence from the given options. A scientist has shown that P : when anyone holds Q : a burning cigarette R : near their leaves S : plants react with fear Which one of the following is the correct sequence?

• A

  P – Q – R – S
• B

  Q – R – S – P
• Correct answer
  C

  S – P – Q – R
• D

  P – Q – S – R

Hence, the correct answer is option: 'C'.