A

Step 1: When a body is immersed in a liquid, it displaces a volume of liquid equal to the volume of the part of the body that is submerged.
Step 2: According to Archimedes' principle, the buoyant force acting on the body is equal to the weight of the liquid displaced.
Step 3: As the liquid is heated, its density generally decreases (assuming it's a liquid that expands when heated, like water).
Step 4: The reduction in density means that the same volume of liquid will exert a lesser weight, thus decreasing the buoyant force acting on the object.
Step 5: However, the actual weight of the body plus the buoyant force must still add up to the total weight measured by the scales. As the liquid expands, and since the scales measure the total weight (body + buoyant force), the reading will remain the same.
Therefore, the reading of the scales will not be altered.