Identify the correct statements about pipelines.
(A) Pipelines are extensively used to transport liquid and gases.
(B) Pipelines can also be used to transport liquified coal.
(C) Milk is not supplied through pipelines in any country of the world as it is unhealthy.
(D) LPG is supplied only through gas cylinders for safety reasons.
Choose the correct answer from the options given below:

The correct answer is (A) and (B) only.

Let's analyze each statement step-by-step to understand why this option is correct:

Statement (A): Pipelines are extensively used to transport liquid and gases.
This statement is correct. Pipelines are the most convenient, efficient, and cost-effective mode of transporting large volumes of liquids (like water, crude oil, and petroleum products) and gases (like natural gas) over long distances without transit losses.

Statement (B): Pipelines can also be used to transport liquified coal.
This statement is correct. Coal can be crushed, mixed with water to form a slurry (mixture), and then transported through pipelines. This method is highly useful for conveying solid fuels like coal to thermal power plants.

Statement (C): Milk is not supplied through pipelines in any country of the world as it is unhealthy.
This statement is incorrect. Milk is indeed transported via pipelines in some parts of the world. For instance, in countries like New Zealand and the Netherlands, specialized milk pipelines are used to transport fresh milk directly from farms to processing factories, maintaining high standards of hygiene and health safety.

Statement (D): LPG is supplied only through gas cylinders for safety reasons.
This statement is incorrect. While LPG is commonly supplied in cylinders for domestic use, it is also widely distributed through piped network systems directly to households and industries in many urban areas around the world.

Therefore, only statements (A) and (B) are correct, making (A) and (B) only the right choice.