Combination reaction can be represented as:

Correct option is D

The correct answer is (D) AB + C → ABC

Explanation:
• A combination reaction is one in which two or more substances combine.
• The reaction results in the formation of a single product.
• General form of a combination reaction is A + B → AB.
• Option (D) shows two reactants forming one product.
• Hence, AB + C → ABC correctly represents a combination reaction.

Information Booster:
• Combination reactions are also called synthesis reactions.
• They are usually exothermic in nature.
• Example: CaO + H₂O → Ca(OH)₂.

Additional Knowledge (Incorrect Options):

(A) ABC → AB + C
• This represents a decomposition reaction.
• One compound breaks into simpler substances.

(B) AB + CD → AD + CD
• This shows double displacement.
• Exchange of ions occurs between compounds.

(C) AB + C → CB + A
• This represents a single displacement reaction.
• One element replaces another in a compound.