Gross private domestic investment includes business: a. purchases of capital goods, all new construction, and inventory investment. b. purchases of all types of durable goods, all new construction, and inventory investment. c. purchases of capital goods, all new construction, and purchases of consumer durable goods. d. purchases of capital goods, all new commercial construction, and inventory investment.

a. purchases of capital goods, all new residental constructionand inventory investment

Explanation:

It is the investment measure used for determining the GDP. It is an important part of GDP as it is used as an indicator for the productive capacity i.e. future. It involves the purchase i.e. replacement, net addition made to the capital assets, and the investment made in inventories

So according to this, the option a is considered as it involved all three thins that are shown above

answer; microeconomics;