The most accurate statement about the experience of immigrants in the Chesapeake colonies during the seventeenth century is:
"The danger posed to new immigrants in the Chesapeake colonies persisted throughout the seventeenth century, especially during the late summer."
This statement accurately reflects the passage's emphasis on the high mortality rates among new arrivals and the ongoing dangers they faced, particularly in the context of "seasoning" and disease. The other statements either misrepresent the conditions faced by immigrants or suggest an improvement that the passage does not support.