Step 1: Understanding services.
Services are intangible products that cannot be physically touched or owned. They include activities that benefit individuals or organizations, such as insurance, coaching, and services provided by canteens.
Step 2: Analyzing the options.
(A) Canteen: A canteen provides food and drinks, which are services, not tangible products.
(B) Insurance: Insurance is a service that provides financial protection in exchange for a premium.
(C) Coaching: Coaching is a service where an expert guides and trains individuals in a specific field.
(D) All of these: Correct. All of the options listed are services.
Step 3: Conclusion.
The correct answer is (D) All of these, as all listed options fall under the category of services.