The correct option is 2016-17.

To find the year in which the percentage (%) increase in the Net National Income (in Lac Crore rupees) over the previous year was maximum, we calculate the percentage increase for each of the given years relative to its preceding year.

The formula to calculate the percentage increase is:

$$\text{Percentage Increase}=\left(\frac{\text{Net National Income in Current Year}-\text{Net National Income in Previous Year}}{\text{Net National Income in Previous Year}}\right)\times 100$$

Let's calculate this percentage increase for each period step-by-step:

1. For the year 2016-17:
Net National Income in 2016-17 = 136 Lac Crore rupees
Net National Income in 2015-16 (previous year) = 122 Lac Crore rupees
Increase in Income = 136 - 122 = 14 Lac Crore rupees

$$\text{Percentage Increase}=\left(\frac{14}{122}\right)\times 100\approx 11.48\%$$

2. For the year 2017-18:
Net National Income in 2017-18 = 151 Lac Crore rupees
Net National Income in 2016-17 (previous year) = 136 Lac Crore rupees
Increase in Income = 151 - 136 = 15 Lac Crore rupees

$$\text{Percentage Increase}=\left(\frac{15}{136}\right)\times 100\approx 11.03\%$$

3. For the year 2018-19:
Net National Income in 2018-19 = 167 Lac Crore rupees
Net National Income in 2017-18 (previous year) = 151 Lac Crore rupees
Increase in Income = 167 - 151 = 16 Lac Crore rupees

$$\text{Percentage Increase}=\left(\frac{16}{151}\right)\times 100\approx 10.60\%$$

4. For the year 2019-20:
Net National Income in 2019-20 = 177 Lac Crore rupees
Net National Income in 2018-19 (previous year) = 167 Lac Crore rupees
Increase in Income = 177 - 167 = 10 Lac Crore rupees

$$\text{Percentage Increase}=\left(\frac{10}{167}\right)\times 100\approx 5.99\%$$

Comparing the calculated percentage increases:
- 2016-17: 11.48%
- 2017-18: 11.03%
- 2018-19: 10.60%
- 2019-20: 5.99%

Hence, the maximum percentage increase in the Net National Income over the previous year was recorded in the year 2016-17 (11.48%).