When a consumer has evaluated alternatives in the purchase decision process and selected one, he still must determine from whom he will buy and:

The correct answer is when to buy.

Explanation:

When a consumer has checked all the alternatives and has made the purchase decision of what to buy, he still needs to decide from whom to buy and at what time or when to buy. This is because the price of assets or goods keeps changing with the passage of time. The change in price depends on market situations at that time.

There are a number of factors that affect the price level in the market. For instance,

Income level Business cycle Interest rates

Changes in these factors cause a change in the price of goods and services and other assets.