Answer :

Based on historical records and relevant data, let's analyze the options provided to determine the correct portion of residents in 1700 New York City who were enslaved.

1. Less than 10%: Many historical sources suggest that the percentage of enslaved individuals in early New York City was significantly higher than this. Less than 10% does not accurately reflect the historical data.

2. 15-20%: This range is noted in several historical documents. In 1700, a considerable portion of New York City's population was enslaved, with estimates falling within this percentage range.

3. 40%: This is quite high and not supported by historical data. There is no evidence to suggest that 40% of New York City's population in 1700 consisted of enslaved individuals.

4. Over 60%: This is an unrealistic estimate. Such a high percentage of enslaved people is not documented for New York City during this period.

Given these considerations, the most accurate historical estimate is:

15-20%

Therefore, approximately 15-20% of New York City’s residents were enslaved in 1700.