The proper way to handle a plate when serving food is to A Hold it by the bottom. B Place your thumb on the rim of the glass. C Place your thumb on the rim of the glass. D Balance it on your arm.

The correct answer is A. When serving food, it is important to hold the plate by the bottom to maintain stability and prevent any spills or accidents. Placing your thumb on the rim of the glass or balancing the plate on your arm can lead to instability and potential accidents.