Read the following paragraph and answer the questions. A push or pull on an object is defined as a force. Forces which involve physical contact between two bodies on which they act are known as contact forces, e.g., muscular force, frictional force, etc. Forces which do not involve physical contact between two bodies on which they act are known as non-contact forces, e.g., gravitational force, electrostatic force, magnetic force, etc. Write the situations in which muscular force is used.
(a) When lifting heavy objects
(b) During magnetism experiments
(c) When sliding on ice
(d) None of the above