Sometimes, you need to say no to others to be able to say yes to yourself, otherwise, you will end up bitter and resentful, feeling that at some po...

Sometimes, you need to say no to others to be able to say yes to yourself, otherwise, you will end up bitter and resentful, feeling that at some point in this process of trying to keep people happy, you lost yourself. What is the author's advice on how to say no?

The author advises to always explain the reason for saying no.
The author advises to follow your heart and keep your peace.
The author advises to never say no to others.
a) Only I is correct.
b) Only II is correct.
c) Only III is correct.
d) Both I and III are correct.
e) Both II and III are correct.