Concept:A tanker is a vessel built specifically to carry liquid or gas in bulk.
Explanation:A tanker carries products such as crude oil, petrol, liquefied gas, or chemicals.
Its design includes large sealed compartments that keep the liquid or gas stable during transport.
A coaster is a small ship used for short coastal routes, not for bulk liquids.
A liner is a passenger or cargo ship operating on a fixed route and schedule.
A ferry is used mainly to carry passengers and vehicles across short water distances.
Therefore, the mode of transport specially designed for liquids and gases is a tanker.
Answer:B. tanker