This question is incomplete. Here is the complete question:
What is the effect of the metaphor from the poem "Can't" by Edgar Guest?
Can't is the word that is foe to ambition
An enemy ambushed to shatter your will...
.It helps the reader understand that when you do not believe in yourself, you will not set goals.
.It helps the reader understand just how terrifying the word really is.
.It helps the reader understand how to fight and battle against the mindset that you can't achieve your goals.
.It helps the reader understand that parents are more likely to use the word than their children.
Answer:
The correct answer is It helps the reader understand that when you do not believe in yourself, you will not set goals.
Step-by-step explanation:
This poem by Edgar Albert Guest clearly demonstrates how our success depends on ourselves, and how self-convincing with "I can't" leads us to failure.
It talks about the word "can't" as an enemy of ambition, and that it is just what it is. Someone who says to himself "I can't" does not prove to have much ambition in life, otherwise he would try until he got what he wanted.
Mentioning this, even the last words of the poem are:
Whatever the goal you are seeking, keep trying
And answer this demon by saying: "I can."
Which leads us to the conclusion that the correct answer is It helps the reader understand that when you do not believe in yourself, you will not set goals.