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If a car has difficulty starting up, despite having a full tank of gas and no problems with the electrical system, the next possible reason is because ____.

A the air filter is very dirty
A car ignites with a spark, fuel, and oxygen. Oxygen can flow in through the air filter. If the air filter is clogged, air and therefore oxygen cannot come in.
B the pressure in the wheels is low
C the hand brake is engaged
D the battery is dead or missing