The starting point of late adulthood is best described as

Vague

Explanation:

As the adulthood starts to begin,it starts to is considered as vague because it is considered to unpredictable and unclear.As the emerging adulthood is found in a person , the feature of being insecured and impreciseness is present.

For example of vagueness in activities during the adult age of a person can be seen in driving , intimate relationship,drinking , voting etc during their legal age.

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answer (b); /// a method of measuring the opinions of a large group of people by selecting a subset of the larger group, asking them a set of questions and then generalizing those responses;