2. Which of the following correctly writes a complex sentence?
A) Alma cannot eat many types of bars, for she is allergic to peanuts.
B) Although my sister acts tough all the time, she's actually a big softie on the inside.
C) There were many things that confused me today, such as the math test and my brother's anger.
D) I saw a couple stray dogs today, when I was walking quickly to the bus stop.