Final answer:
The obligation of real estate professionals in transactions involving properties built before 1978 is to give buyers an EPA booklet and have them sign the disclosure.
Step-by-step explanation:
The correct answer is A) give buyers an EPA booklet and have them sign the disclosure.
In transactions involving properties built before 1978 that might have lead-based paint, real estate professionals are obligated to provide buyers with an EPA booklet about the hazards of lead-based paint. The buyers should also be asked to sign a disclosure indicating that they have received this information.
This is important because lead-based paint can be harmful, especially to children, if it deteriorates or is disturbed during renovations.