Hello, the correct answer would be either A or D. B cannot be correct because it still remains a fragment. The same case is with C. A might be correct in the following sense: Since, they had traveled often. "Since" meaning - after that. And D might also be correct because if you delete "since", you are left with - "They had traveled often", which is a completely correct and completed sentence.
how challenging it is for other people to live in this world.
Answer: Option A.
<u>Explanation:</u>
In the paragraph that has been given in the question, the author talks about the tests and the challenges that she has to take just like the other people have to take these tests in their life.
She is trying to emphasize on the importance of these tests and these challenges in the life by using this word again and again, repeating it some where tries to show the importance of this word. This tries to tell how tough and challenging some times life becomes.
The answer is B, 246,000
Hope this helped
The answer would be C, I hope I helped ! :)
