Multiple reactants combine to give a single product.

• A. Addition (combination) reactions
• B. Single displacement reactions
• C. Decomposition reactions
• D. Double displacement reactions

Answer: (A)

Combination (synthesis) reactions occur when two or more substances react to form a single product, often written as A + B -> AB, or with more reactants A + B + C -> ABC. This is exactly what the statement describes: multiple reactants come together to produce one compound. For example, 2H2 + O2 -> 2H2O shows two reactants combining to form one product.

In contrast, a single displacement reaction involves one element replacing another in a compound, producing a different compound and a free element. A decomposition reaction is where a single compound breaks apart into two or more products. A double displacement reaction involves two compounds exchanging partners to form two new compounds.