Many cast iron pistons are designed with heat dams, which serve to （）<br>A:keep piston crown temperatures elevated for smoother combustion<br>B:reduce the possibility of overheating the top compression ring<br>C:help retain the heat of compression to prevent ignition delay<br>D:help retain the heat of compression to prevent combustion knock

Many cast iron pistons are designed with heat dams, which serve to （）
A:keep piston crown temperatures elevated for smoother combustion
B:reduce the possibility of overheating the top compression ring
C:help retain the heat of compression to prevent ignition delay
D:help retain the heat of compression to prevent combustion knock

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