Which of the following is an acceptable abbreviation on a MAR or label?

In the context of medication administration, it is essential to use clear and universally understood abbreviations to prevent errors. Among the choices, the use of "A.C." is an acceptable abbreviation, which stands for "before meals." This term is commonly recognized in medical settings and ensures that the administration of medication occurs at the proper times related to food intake, which can be critical for drugs that need to be taken on an empty stomach or with food for optimal effect.

The other abbreviations listed may not be as clear or can lead to confusion due to different interpretations. "QD" (once daily) and "QOD" (every other day) are both abbreviations that have been discouraged in many facilities because of ambiguity; they can be easily mistaken, potentially leading to serious medication errors. "OU," which means "both eyes," is also less frequently recommended due to the potential for miscommunication regarding its usage. As a result, clarity in medication orders is crucial, which is why "A.C." is the appropriate choice among the options provided.