The correct answer is option (E):
QPSR
The correct answer is QPSR. Here's a breakdown of why this sequence creates a coherent and meaningful sentence:
* **Q: Coconut is the major crop cultivated by small and marginal** - This begins with the subject and introduces the topic: coconut cultivation.
* **P: Farmers of South India, particularly, Kerala** - This expands on the previous sentence by specifying who is cultivating the crop, and where.
* **S: For every farmer, the practical difficulty in carrying out plant protection in** - This presents a challenge faced by the farmers.
* **R: Coconut is the cost and unavailability of laborers** - This is the problem. It is the cost and unavailability of labor that is the practical difficulty in S.
Therefore, QPSR flows logically, linking the crop, the farmers who cultivate it, the practical difficulties in protecting it, and the issues causing the difficulties.
The other options don't create logical sequences. For example, starting with "PRQS" or "RQPS" doesn't establish the initial topic of coconut farming smoothly. "SQRP" starts the sentence with "For every farmer," which doesn't make sense as the introductory phrase. "SQPR" creates a similar issue.