The graph below shows the number of sunspots observed between 1750 and 2000.
Based on the graph, which of these periods most likely witnessed the greatest increase in solar radiation
![The graph below shows the number of sunspots observed between 1750 and 2000 Based on the graph which of these periods most likely witnessed the greatest increas class=](https://us-static.z-dn.net/files/dad/ae3a73c9340f0dc04f7877e2d3c6639b.jpg)