The answer is C. The program prints:
rocket-rocket-rocket-
This answer was checked by running the program for real.
Why?
Multiplying a string by a number repeats it. * 3 makes 3 copies, joined together with nothing in between (the ‘-‘ is part of each copy).
The code again
word = "rocket"
print((word + "-") * 3)
Try it: change one number in the program and predict the new output before you run it.