What Solutions to population growth
might a penson from Europe suggest?

A person from Europe would probably advice measures that have been taken in Europe in the past, and that have been shown to work there, since population growth in Europe has been falling steadily since the mid 20th century.

Explanation:

Some of these measures are: involving women in the labor force, because working women tend to have less children than non-working women. Increasing education levels for all people, because highly educated people tend to have less children than less educated people, and finally, making birth control methods and sexual education readily available since teenagehood (this has the added value of preventing teenage pregnancies).

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i would say b. research typically uses a variety of sources