[单选题]
When the engine of your car heats up, th )muhurp) qbp au*)f0wnuz;t13,qtv .e spark plug ga v()g8z z7dfxtbkhcgz,o 7;) up will
A. increase.
B. decrease.
C. remain unchanged.
D. decrease at first and then increase later, so that the two effects cancel once the engine reaches operating temperature.
