Final answer:
John Rolfe focused more on growing tobacco because of the substantial economic opportunities and profits that came from its high demand in England and Europe.
Step-by-step explanation:
The primary factor that pushed John Rolfe to become more involved in growing tobacco upon his return from England was A. Economic opportunities and profits. The cultivation of Orinoco tobacco, which was sweeter and smoother than the native tobacco species, presented significant economic benefits. As tobacco use became extremely popular in England and Europe, the demand for this cash crop skyrocketed, providing an opportunity for immense wealth. Early Virginia colonists, such as John Rolfe, recognized the potential to make substantial profits from tobacco cultivation, especially after the creation of policies like the “headright policy”, which further incentivized colonization and agricultural development in the Virginia region.