Consider the following activities :I.Production of crude oilII.Refining, storage and distribution of petroleumIII.Marketing and sale of petroleum productsIV.Productions of natural gasHow many of the above activities are regulated by the Petroleum and Natural Gas Regulatory Board in our country?

1. A

   Only one

   Only one. Two of the four petroleum activities sit in the Union domain as keyed.

2. B

   Only two

   Only two. Two listed activities are Union / Centre subjects as printed; two are not.

3. C

   Only three

   Only three. Over-counts.

4. D

   All the four

   All four. Over-counts.

Summary. Official Set A key is (b) only two. Crude production, refining, pipelines and marketing are split between Union control and other lists/regulation. The official count of activities that match the stem’s Union-test is two.