Which of these statements is subjective?
a. on sunny days in seattle, you can see mount rainier.
b. ferryboats come in and out of the port of seattle.
c. seattle is the most beautiful city in america.
d. seattle is located in the pacific northwest.

A subjective sentence shows somebody's personal feelings and thoughts about something or someone. Having this in mind, the subjective sentence here is C. Seattle is the most beautiful city in America.
Other people may not find it to be the prettiest, so it's subjective. The other options are just facts.

The only reason based on my own answer or some of my instinct jack flack up and down and then twist all around before taking his medicine is because the label of his medicine says that you need to shake well before using or before taking it.