A nonrestrictive modifier adds information that is not essential for the reader to understand the sentence. In case the nonrestrictive modifier is eliminated, the meaning would remain the same. Only nonrestrictive modifiers are separated by commas. Taking this into account, the sentences that contain correctly punctuated nonrestrictive modifiers are:
- My oldest sister, Maria, is a pilot - If we remove <em>Maria</em>, we can still identify which sister we are talking about.
- My two best friends, Tory and Monica, met me at the movies - If we remove <em>Tory and Monica</em>, we can still identify which two people we are referring to.
- Bulldogs, which I love, are the cutest! - If we remove <em>which I love</em>, we can still identify which dogs we are talking about.
The correct answer is:
The first object which saluted my eyes when I arrived on the coast was the sea, and a slave ship, which was then riding at anchor, and waiting for its cargo. <u>These filled me with astonishment, which was soon converted into terror</u> when I was carried on board. I was immediately handled and tossed up to see if I were sound by some of the crew; and <u>I was now persuaded</u> that I had gotten into a world of bad spirits, and <u>that they were going to kill me</u>.
The central idea of this paragraph are in bold and the <u>supporting details</u> are <u>underlined</u>.

Answer:
To remove the "dead-weight phrase" in the sentence: "It has been found that most people consider buying a house the largest purchase they can ever make," it can be rewritten as follows:
"Most people consider buying a house the largest purchase they can ever make."
Explanation:
A dead-weight phrase is one that is not helpful in a sentence to convey the intended meaning. This implies that the meaning can still be picked up without the phrase. For example, the phrase: "it has been found that" is not necessary in the sentence. The meaning of the sentence is conveniently conveyed with its omission. The meaning is not lost if the sentence is rewritten as "Most people consider buying a house the largest purchase they can ever make."
Generally, a dead-weight is an unnecessary burden that can be jettisoned to make a load lighter. Also an unhelpful person can be considered as a dead-weight.
<span>Viewpoint is also known as opinion or standpoint or your perspective on some particular things. Someone's viewpoint is the means that they contemplate about things in broad-spectrum, or the means they think about a specific thing. So the answer for here is B.</span>