Which of the Following Statements Is LEAST-Likely True

Which of the following statements is LEAST-Likely true?

A) An aftercooler is a sophisticated and expensive air cooler installed at a point after air has been compressed.
B) For every 10⁰F the air-fuel mixture is cooled, there is a power loss of about 1%.
C) Aftercoolers are relatively trouble-free, and they are cooled by either air or water.
D) Pressure produced by the turbo can cause fuel to detonate in the cylinder.