Which one of the following statement is correct regarding Journal friction?

• A. Caused due to the wave action of rails.
• B. The amount does not depend upon the type of bearing.
• C. For roller bearings, it varies from 0.5 to 1.0 kg per tonne.
• D. For coupled boxes, it lubricates by hard grease from 0.5 kg to 1.0 kg per tonne.