Does anyone here know about Economics? GDP (Gross Domestic Product) to be exact; I need your help!?

Question

Indicate where the activity would be recorded on the expenditure side of U.S. GDP accounting. Your choice are C, I, G, X (exports), M (Imports), and NR (not recorded).

a. A housing developer buys 10 acres of land near 880 freeway in Oakland, California.
b. The housing developer builds 50 new houses on those 10 acres of land.
d. The Oakland Police Department hires an additional police officer due to high crime wave in Oakland.
g. A homeowner in Oakland mows her lawn and straightens up the yard.
h. A homeowner in Oakland drives to Home Depot and buys a new microwave, which was manufactured in China.
j. A San Francisco-based architect sells plans for a new office building to a company in Shanghai.
k. David Simon grows tomatoes for home consumption.
n. A refurbished DVD player bought on ebay.
o. The piling up of inventories on Safeway's shelf.

I need help, does anyone know what side of GDP do these record on? (consumtion, investment, government exp., exports, imports, or Not Recorded)

Answer 1

a. NR the purchase of land produces nothing just changes ownership
b. I a house has a long useful life
d. . G
g. NR
h. M/C the microwave is a import other cost C
j. .X
k. NR
n. .NR/C the refurbishing cost C
o. .NR

Answer 2

a. NR
b. Investment
d. Government exp
g. NR - GDP does not account for non-market production (DIY and house work)
h. Import and Consumption
j. Export
k. NR
n. NR and Consumption
o. NR

Answer 3

a. investment
b. consumption
d. not recorded
g. not recorded
h. consumption
j. exports
k. not recorded
n. not recorded
o. not recorded

This is a guess.