Answer:
cross-sectional
Explanation:
Cross-sectional research: In cross-sectional research, the experimenter or the researcher examines a group of people, specific context, and a social phenomenon with the help of a sample. The cross sectional-study or research is also known as transverse study, prevalence study, etc. This is a type of an observational study, that examines a particular population data in a specific time.
Advantage:
1. Cost-effective
2. Easy to gather and assess data.
3. Less time taking.
In the give question, Dr Cross is studying the relationship between age and dependency/independence using cross-sectional research.
The theory of delegate representation is best illustrated by "my job to present the people who elected me regardless of my point of view".
<h3>Who is a delegate?</h3>
This refers to a assigned person to represent a society, region etc as a representative in a political convention.
Hence, a delegate representation is expected to say that my job to present the people who elected me regardless of my point of view.
Therefore, the Option B is correct.
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