Answer
The ultraviolet region.
Work Step by Step
This question requires us to find out the region of the electromagnectic spectrum where the energy absorbed by ozone, which stays in the 210 - 230nm range of spectrum, stays. In this type of question, you only have to look up the electromagnetic spectrum if you don't remember the range of each of its region (and change the units if necessary). 210 - 230nm falls into the the ultraviolet region, whose range of wavelength is between 10 nm ($10^{-8} m$) and 400nm ($4\times10^{-7}m$).
