D. ur answer is d because all the other have no errors and make sense yw :)
C) summary as it shows why Okies are how bad and why
Nonrestrictive because the sentence you "My brother who lives in Hawaii is a surfer" is not restrictive but the answer to your question is = Nonrestrictive.
Walked. We is the subject and to the Park is where the subject went. Walked is what they did.
"All of a sudden..." is a transition that shows suspense. It says something happened, but it didn't happen with any warning and it doesn't tell the reader up front what went on or if it was good or bad.
