Kent, a manager at ITP Inc., was asked by his supervisor to sign a contract with a new supplier. The contract stated that the industrial waste released by the company would be released into a local river. Kent was against this idea of polluting the river with the waste, so he refused to sign the contract. In this scenario, Kent exercised his right of:________

a. freedom of conscience.
b. first refusal.
c. freedom of speech.
d. privacy.
e. free consent.