The correct answer is women.
The initially settling of Jamestown consisted of roughly 100 men who saw the ability to colonize in the New World as a means to increase their personal wealth. These men went to the New World in search of gold and other resources that would allow them to be rich. Along with this, men were needed in order to perform the hard manual labor needed to build homes and the protection necessary to keep the colonists from being killed by Native Americans.
At this time, women rarely did this type of manual labor due to the social norms of the era. This helps to understand why women were absent from this trip.