Why must Valencia type peanuts be sized?

Valencia type peanuts must be sized primarily to assess the percentage of "fancy" size. In the peanut industry, the classification and grading of peanuts are important for marketability and pricing. Fancy-sized peanuts are those that meet specific quality and size criteria, making them more desirable for consumers and processors.

Sizing helps in determining the proportion of these premium peanuts relative to other sizes. This is crucial because larger and uniformly sized peanuts often command higher prices in the market due to their appeal and better processing qualities. By ensuring that Valencia peanuts are sized properly, inspectors can accurately report their quality classification, which ultimately affects their sale and distribution.

The other options touch on important aspects of peanut inspection, but they do not directly relate to the primary reason for sizing Valencia peanuts. Taste evaluation is subjective and not dependent on size, contamination levels can be determined through different testing methods, and while moisture content is crucial, it is measured separately, not through sizing.