Which of these areas in the colonial era would be likely to have the greatest number of large landowners and indentured servants?

The colony that had the most indentured servants was the Commonwealth of Vriginia.

The majority of them arrived in the seventeenth century, during the first decades of the Colony. They were hired to meet the labor demand that was needed in the tobacco plantations.

The indentured servants worked in harsh conditions for a few years to pay for trip expenses, after the period of servitude expired, they became free. Many of them died quickly, due to dieseases, and harsh living conditions.

d is the best answer for this question.