Justin and Michael Form a Limited Partnership and Start a Car

Justin and Michael form a limited partnership and start a car dealership. Justin is the general partner and Michael is the limited partner. Seven months after the commencement of the business, Pedro makes an investment and wishes to become a general partner. A week later, Michael's mother wishes to join the partnership as a limited partner. Which of the following is true in this scenario?

A) Pedro cannot become a general partner to the partnership after the business has commenced.
B) Pedro cannot become a general partner to the partnership as a limited partnership can only have one general partner.
C) Michael's mother cannot become a limited partner to the partnership as a limited partnership can only have one limited partner.
D) Both Pedro and Michael's mother can choose to become either general or limited partners to the partnership.