Which of the following is written correctly? A. "Hey", he said, "do you have any ideas of what we can do for your moms fortieth birthday."
B. "Hey," he said, "do you have any ideas of what we can do for your moms' fortieth birthday?"
C. "Hey," he said, "do you have any ideas of what we can do for your mom's fortieth birthday?"
D. "Hey", he said, "do you have any ideas of what we can do for your moms fortieth birthday!"​