Question

if a vehicle passes a(n) _________ test with clean results, that is a good indication that all of the engine systems and the engine itself are operating well. a. combustion b. emissions c. repair d. maintenance

Explanation:

An emissions test checks pollutants from a vehicle. Clean results mean engine systems (like fuel - air mixture, combustion) work well. Combustion is part of engine operation but not a test name here. Repair and maintenance are processes, not tests that directly indicate overall engine system health like emissions.

Answer:

B. Emissions