When the government of any country restricts the sale of a particular commodity to certain groups — for example, restricting sales of alcohol to individuals of age 21 and over — the eligible consumers who have income, interest, access, and qualification constitute the market.

qualified available

Explanation:

Qualified available Market refers to the situation when only customers with specific criteria are able to make a purchase. In most cases, those criteria revolved around age, gender, or group membership.

Alcochol is an example of qualified available market because it created a situation which only allow consumers older than 21 to make a purchase.

Other example would be Waxing salon.  Large portion of waxing salons only allow female customers to purchase their service (since the workers are also females and feel uncomfortable to give their service to male customers.)

a government agency or homeowner.- third choice