5. If we told them the truth, they ____ us. a) Believed b) will believe c) would believe

The correct answer is c) would believe. Explanation: This sentence is a Type 2 conditional, which expresses an unreal or improbable situation in the present or future. The correct structure is: If + past simple, would + infinitive So, the correct sentence is: If we told them the truth, they would believe us.