Can the state make laws imposing reasonable restrictions on the exercise of the rights conferred by sub-clause (c) of clause (1)? If so, under what conditions?
Yes, the state can make laws imposing reasonable restrictions on the exercise of the rights conferred by sub-clause (c) of clause (1). The conditions are mentioned in section 3:

(4) Nothing in sub-clause (c) of the said clause shall affect the operation of any existing law in so far as it imposes, or prevent the State from making any law imposing, in the interests of 4[the sovereignty and integrity of India or] public order or morality, reasonable restrictions on the exercise of the right conferred by the said sub-clause.