Which choice most logically completes the text?

Source Texts

Text

The Study on Global Ageing and Adult Health (SAGE) seeks to discover long-term trends related to aging by compiling and analyzing evidence from approximately 66,000 participants in multiple countries. As with most longitudinal studies, extensive funding support is needed for SAGE to collect the relevant data over timescales and at intervals that will support robust conclusions. But the quality of a more constrained investigation, such as a sociology study seeking only to yield the average age at which people in a given city first become parents, is much less dependent on high levels of funding because ______

the sociology study is unlikely to be able to recruit 66,000 participants

such studies are likely to be a lower priority for funding than SAGE.

expanding the scope of such studies is unlikely to be feasible.

such studies are not trying to identify trends over time.