What is the main reason why many people do not enjoy life, lose some of the blessings that God wants to give them, or feel bad about themselves? I...

What is the main reason why many people do not enjoy life, lose some of the blessings that God wants to give them, or feel bad about themselves?

I- They never try the joy of achieving a goal or fulfilling a desire because they do not persevere through the challenges that arise.
II- They admit that they are quitters and give up easily.
III- They blame someone or something else for their failures.
a) Only I is correct.
b) Only II is correct.
c) Only III is correct.
d) I and III are correct.
e) I, II, and III are correct.