In a high-performance internal combustion engine, which risk substantially increases within the piston assembly during sustained detonation?

💡 Explanation

Thermal fatigue increases with sustained detonation because the rapid, uncontrolled combustion cycles produce intense heat spikes. This initiates thermal fatigue cracking via repeated expansion/contraction rather than primarily affecting lubrication. Therefore, option A is correct; rather than B, C, or D.

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