The characteristic property of detergent is

• Detergents are amphipathic this means that they contain polar or charged hydrophilic groups (heads) as well as nonpolar hydrophobic tails at the end of long hydrocarbon chains.
• Detergents are used as emulsifiers in water-oil-type solutions.
• It helps in emulsifying oil in water such that it can be removed. 

Hence all given statements are true. Hence option D is the correct answer.