Which parameter would be assessed to determine the degree of anxiety being experienced by the client?

The correct parameter to assess the degree of anxiety experienced by a client is the perceptual field. As anxiety increases, perceptual fields tend to narrow. Memory state, creativity level, and delusional system are not directly related to the level of anxiety and are not appropriate parameters for determining the degree of anxiety. Memory state refers to the ability to remember, creativity level to the ability to generate new ideas or solutions, and delusional system to a set of false beliefs.