It seems that you have missed the necessary options to answer this question but anyway, here is the answer. The widespread problem that Ishmael Beah attempts to reveal in his memoir A Long Way Gone is the <span>use of children and teenagers as soldiers in armed conflict. Hope this answers your question.</span>
So first you would want to round the numbers to the nearest tenth.
243.9 + 132.4= 376.3
If Erika's teammates so happened to give her a lot of reasons to go along with their plan, then the implicit message (or the underlying meaning; 'read-between-the-lines- message) would be that Erika should agree too it because it is a good plan that they were proposing.
D: the author debates a topic and urges readers to accept a certain point of view