🔍 Key Concepts

• Sources of ignition in engine and fuel spaces • How electricity and motors can create sparks or heat • The conditions required for fuel vapors to catch fire (ignition source + vapor + oxygen)

💭 Think About

• For each option, ask yourself: could this realistically create a spark, arc, or high heat near fuel vapors? • Think about where fuel vapors accumulate on a boat and what equipment or conditions are usually nearby. • Consider whether exam questions about safety often focus on a single cause or on recognizing multiple hazards at once.

✅ Before You Answer

• For each choice (A, B, C), decide: can this create sparks, arcs, or hot surfaces that might ignite vapors? • Remember that fuel vapors are heavier than air and collect in low spaces—what equipment or conditions are commonly present there? • Double‑check whether any option is clearly not a possible ignition source before ruling it out.