Which of the Following Statements Is LEAST-Likely True

Which of the following statements is LEAST-Likely true?

A) Computers in North American vehicles use power side switching with current limiting devices.
B) Today's transmissions ground their switches through the computer in response to various inputs.
C) Transmission failures are sometimes caused by someone adding trailer brakes.
D) Speed sensors are usually permanent magnet generators that can be tested with a digital multimeter using its alternating current (AC) voltage scale.