What generalization can you make about the importance of rice in the economies of the 13 colonies

During the time of the 13 colonies, the production of rice was being used for the payments of rents to the British proprietors.

Explanation:

There is strictly no particular crop that has gained development on a commercial scale in the British nor american colonies underwent such an extended period  of both intensive and extensive experimentation of such kind as rice. And nor was other, that was profitable for the capital invested, this thereby justify the long, costly, and doubtless trying period of development.

your list doesn't mention any of them at all.

and what does "these" mean anyway ?