वर्ष 2021-22 के दौरान भारत के आयात में उनकी हिस्सेदारी के अनुसार निम्नलिखित वस्तुओं को अवरोही क्रम में व्यवस्थित कीजिए: (A) पेट्रोलियम, तेल और स्नेहक (लुब्रिकेंट्स) (B) रासायनिक उत्पाद (C) उर्वरक और उर्वरक विनिर्माण (D) लोहा और इस्पात नीचे दिए गए विकल्पों में से सही उत्तर चुनिए:

Which institution maintains the buffer stocks of wheat and rice in India?

Consider the following statements regarding the Consumer Price Index (CPI) and its implications: I. The revised CPI aligns item weights with recent Household Consumption Expenditure Survey (HCES) data, better reflecting current consumption patterns. II. Under the revised index, services-related components (such as housing, health, education, and transport) carry a higher relative weight than earlier, improving the index's sensitivity to services inflation. III. A change in the CPI base year alters the measured inflation rate by itself, even if prices of all goods and services remain completely unchanged. IV. State-level inflation differentials under the revised CPI reflect differences in consumption structures in addition to food price movements. How many of the above statements are correct?