It's "computers", because they're the subject of the verb to be.
I think.
Honestly, all of them can. I would select them all. Context is the only one that’s iffy, but context is also important because words can have connotative meanings that alter their meaning and tone.
The Gettysburg Speech is perhaps the most important speech in US history. This speech was delivered by Lincoln in less than two minutes, at the end of the American civil war. That's because the message he wanted to give was fast, clear and didn't need a lot of arguments, because it was evident that it was true.
Lincoln inspired by the principles of equality defended in the Declaration of Independence of the country, declared the end of the war based on the concept that the country was born to be a country of free people and owners of their own lives, the end of the war allowed freedom be offered to everyone, as the founding fathers wanted and fought for it. Thus, Lincoln established that the end of the war would bring a nation united in recovery and truly free.
Read the problem carefully and see the available information The information helps us to get into the problem.
Explanation:- H1> Here root is the main course of action and it is also the solution to the problem.
H.2. This is not only related to any specific issue but a whole gamut of things is said to be involved in it. One should remain focused and remain committed to the goal.
H.3> A strategy should be developed to solve this problem.
