What is the verb in water droplets in the sky are called precipitation?

Which can writers improve their writing

Which sentence best contrasts two things? a. air travel, like bus travel, is a fun way to get from one place to another. b. air travel is a fun and relatively easy way to get from place to place. c. both bus travel and air travel require substantial planning. d. air travel is much more expensive than bus travel.

How does the author foreshadow trouble in the prison? support your answer with explicit textual evidence.