Read the following topic sentence from an expository essay: Knowing what to bring along is one way to make air travel more
convenient.
Which supporting detail would best develop this topic?
A. Air travel generally costs more than traveling by train.
B. Sturdy shoes are a must for most trips, especially those that
involve walking.
C. The Universal Airlines website says, "Passengers must remain
seated during takeoff and landing."
D. Passengers must provide identification and a ticket before
boarding

taking into account that a theme is the central topic a text treats and can be developed through a story, play, poem etc. the following are themes that can be further developed:  

my best friend jeffrey has many unusual interests. (the story could be about each of the unususal interests)

once a man gives his soul over to evil, he can never go back. (this could be a saying or a proverb)

the three sheepdogs lay around the yard all day. (it could be developed detailing how each of these sheepdogs lay around)

a priest's collar has an unusual effect upon people. (it could be developed detailing the different effect upon people)

innocence is a powerful force in a world full of corruption. (it could be developed detailing how is a world full of corruption)

king lear is a play shakespeare wrote later. (it is just a sentence and doesnt give any idea or topic to be discussed in details.

evil often wears the disguise of innocence. (this could be a saying or a proverb)

b

explanation:

i'm on the same lesson : / i really don't want to do it..

i would pick a. i think this is more of a personal question though.