What statement about flat characters is true

I think I've done this question and these are the choices.

A.) Flat characters have multifaceted story lines.

B.) Flat characters are usually the major characters of a plot.

C.) Flat characters usually only have one trait that is developed in their story lines.

D.) Flat characters are dynamic.

And The Answer Is C.)

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- "despite the fact that portia lives in belmont and has many suitors, bassanio believes that he can win her heart. bassanio plans on overcoming his financial obstacles by borrowing money from antonio to travel to belmont. he then plans on marrying portia and becoming wealthy enough to pay off his debts."