A is a single business or collection of businesses that has a distinct mission, a responsible manager, its own competitors, and an independent position in the firm.

A. Strategic business unit

Explanation:

Strategic Business Unit

It is a fully functional unit of a business that has it's own vision and direction. Also called SBU, it is a division (autonomous) of a big corporation that operates as an independent enterprise with responsibilities focused on a particular range of products and services. It is an independently managed unit of a large company, having its own vision, mission and objectives, manager, supervisor whose planning is done separately from other businesses of the company, and also has competitors different from the ones attached to the big corporation itself.

d, conspicuous consumption is when you try to increase your wealth or social status (and in the case he's trying to create the perception of wealth considering he can't really afford it)

answermarginal cost;