It depends on exactly what you mean by multiple choice. How ever the definition is accompanied by several possible answers from which the candidate must try to choose the correct one.
Let's think about one listening strategy that would help everyone become a more effective listener:
-do not interrupt the speaker or correct their grammatical mistakes
It is true that this rule will make everyone a more effective listener! So the entire statement is true as well.
Answer:
The main problem between the North and the South was the disagreement of slavery.
Explanation:
The North was against slavery, and the South was for slavery. This was the main problem between the North and South because it caused a whole war.