How do i know if this is dramatic irony ?

How do people behave when they are feuding and what characterizes their behavior

You have 24 hours to sleep, eat, work, and do all your personal tasks. which is the most effective way to do more in your day? a. eat less b. sleep less c. work more d. take more breaks

Dogs make wonderful pets because they us stay happy and healthy. the topic sentence is "dogs make wonderful pets." , is this correct? i keep doubting myself.