"The Salerno invasion would not have occurred"
The answer is: C. Not to try and fix them all, but also not participate in them
Thoreau just want people to know that evil exist and there we might not be able to eliminate them completely. By knowing this, we can always prepare ourselves to take care of evils when we need but not completely lose our mind over it. Simply by choosing not to participate is often enough because the more people do it, the less evil would exist in this world.
Unity and strength are a binding force because they keep a group of people together and help them work together based on their collective and individual strengths, which helps to reduce individual weaknesses.
Unity can be defined as the concept of being together and single minded about achieving a particular goal.
This is a very important factor to have especially in a group and mix that with strength and they are stronger and more difficult to defeat. This would help them achieve their goals faster.
Read more about unity here:
brainly.com/question/507147