which of the following models a synthesis reaction?

Answer:

C.

Explanation:

Step1: Recall synthesis reaction definition

A synthesis reaction is a reaction where two or more substances combine to form a single - product.

Step2: Analyze option A

It shows a double - displacement reaction where ions exchange partners.

Step3: Analyze option B

It is a single - displacement reaction where one element replaces another in a compound.

Step4: Analyze option C

Two substances (B and O₂) combine to form a single product (BO₂), which is a synthesis reaction.

Step5: Analyze option D

It is a decomposition reaction where a single compound breaks down into two or more substances.