which bond is the strongest?

Explanation:

Step1: Recall bond - strength relationship

Bond strength increases with the number of bonds between atoms. Single bonds are the weakest, double bonds are stronger, and triple bonds are the strongest.

Step2: Identify bond types

Bond A is a single - C - C bond, bond B is a double - C = C bond, and bond C is a triple - C≡C bond.

Step3: Compare bond strengths

Since triple bonds are stronger than double and single bonds, bond C is the strongest.

Answer:

C