Which of the following statements about energy resource are NOT correct?
A. Natural gas occurs only with oil in oil fields.
B. In an oil well, density of oil is found higher than rocks containing oil.
C. Bituminous is the most widely occurring grade as coal.
D. Russia has the largest gas reserves in the world.
Choose the correct answer from the options given below:

Correct option is A

Natural gas occurs only with oil in oil fields: Incorrect. Natural gas can occur independently in gas fields as well as with oil in oil fields. It is not exclusive to oil fields.
In an oil well, the density of oil is found higher than rocks containing oil: Incorrect. The density of oil is generally lower than the rocks containing oil, which is why oil tends to migrate upward through porous rock.
Information Booster:
· Natural gas can occur both with oil and in separate gas fields. It is commonly found in association with oil deposits but also exists independently in gas fields.
· Bituminous coal is the most common type of coal, known for its relatively high heating value and widespread use in industries.
Additional Knowledge:
  Bituminous is the most widely occurring grade of coal: Correct. Bituminous coal is the most abundant form of coal and is widely used for electricity generation and industrial processes.
Russia has the largest gas reserves in the world: Correct. Russia holds the largest natural gas reserves globally, particularly in Siberia.