Answer:
A struggle between a character and an opposing force.
Explanation:
An external struggle is one that is experienced by a character but that does not come from within. Doubts and insecurities, for example, are not external struggles because the entire battle takes place inside the character's mind.
An external struggle is a fight that the main character might have with an antagonist, a disagreement with a friend, or even a complex situation that involves some other type of external force that is independent of the main character himself.
My favorite memory is when my father was completing his work Objective by Evaluating the Synthesis of chemical compounds and Modifying them, to create an experiment with Independent and Dependent variables. I had come into his office to work on English homework. I was working on Clauses. When I asked my Dad what he was mumbling about he said that the compounds were Indivisible, and that he needed to Eradicate one of the variables, and that the Eradication of one of the variables was Imperative to how well the experiment went. This is my favorite memory because we got to work together.
P.S you can use this as your own if you'd like.
The answer is "informal and simple".
D, one that is left up to interpretation.