单项选择题

Occupational Category of Family Head
Average Weekly Food and Household Expenditures
	Percent of Food and Household Expenditures
Occupational Category of Family Head	Food at Home			Food Away from Home	Personal Care Items， Nonprescri ption Drugs	Housekeeping Supplies	Average Weekly Food and Household Expenditu res
	Meats， Poultry， Seafood	Cereals，Bakery and Dairy Products，Fruits and Vegetables Other	Food at Home
Self—employed Workers	22	25	14	22	10	7	$35.88
Professionals and Managers	19	23	11	29	11	7	$38.77
Clerical and Sales Workers	21	22	11	28	11	7	$32.07
Craft Workers and Machine Operators	23	25	15	21	9	7	$35.44
Laborers and Service Workers	24	27	14	19	9	7	$28.86
Retirees	23	29	14	16	11	7	$19.83

For which of the following categories was the percent of the average annual income(before taxes) spent on food at home the least（）

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