Option 1: 1901-1911

During this period, India experienced a positive population growth rate. This means that the population increased during these ten years.

Option 2: 1911-1921

The correct answer is option 2. During this period, India experienced a negative population growth. This means that the population decreased in comparison to the previous period.

Option 3: 1921-1931

During this period, India experienced a positive population growth rate. The population increased during these ten years.

Option 4: 1931-1941

During this period, India experienced a positive population growth rate. The population increased during these ten years.

In summary, among the given options, the period in which India experienced a negative population growth is from 1911 to 1921.