Which of these situations is not a joint venture?

a.) A famous actor and a charity form a corporation to rebuild a neighbourhood after an earthquake.

b.) Two carpenters form a partnership to build a local playground.

c.) A car company and an airplane designer form a partnership to build the first flying car.

d.) Two real estate developers form a corporation to design and build a new golf course.

e.) Two accountants form a partnership to run an ongoing accounting business.