HELP! THIS IS MY LAST QUESTION ON A TEST! The figure shows triangle DEF and line segment BC, which is parallel to EF:

Part A: Is triangle DEF similar to triangle DBC? Explain using what you know about triangle similarity. (5 points)

Part B: Which line segment on triangle DBC corresponds to line segment EF? Explain your answer. (3 points)

Part C: Which angle on triangle DBC corresponds to angle F? Explain your answer. (2 points)