The correct response to the web client request, based on the provided exhibits, should be a JSON object that includes attributes and payload objects for each route. The Scatter-Gather component in MuleSoft aggregates results from multiple routes and returns them as a single object where each route's result is encapsulated in a numbered object. Therefore, the correct answer is D. This is because the Scatter-Gather outputs an object that contains the results of each route, indexed numerically, each with its own attributes and payload.