Money flow

Stock

Depreciation

Both (a) and (c)

Macroeconomics

Difference between stock and flow

(i) Capital It is a man-made means of production. It is a stock because it is measured at a given point of time.

(ii) Saving It is the surplus of production over consumption. It is a flow as it is measured during a period of time.

(iii)  Gross Domestic Product It is a flow as it is the market value of final goods and services produced within the domestic territory measured during a period of time.

(iv) Wealth It is a stock as it is measured at a particular point of time. 

The basis of classification is the end-use of the product. Goods which are used by the producers in the process of production such as raw material or goods purchased for resale are known as intermediate goods, e.g. shirt purchased by a firm for resale. These goods are still within the production boundary. Goods which are outside the boundary line of production and are ready for use by their final users are called final goods, e.g. shirt purchased by a consumer.

(i) Ice-cream purchased by a consumer is a consumer good.
Reason Here, ice-cream is purchased for the direct satisfaction of human wants.
(ii) Plant and machinery of XYZ company is a capital good.
Reason XYZ company uses plant and machinery in the process of production to produce final products.

Yes, I agree that all producer goods are not capital goods because producer goods includes:

(i) Goods which are used as raw material like wood used to make furniture.

(ii) Goods which are used as fixed assets like plant and machinery.

Capital goods include only fixed assets of the producers. These are durable goods. On the other hand, goods used as raw material are not capital goods.