Show Zone of Impact-Displays the approximate interference impact area. The opacity of the circle denotes its severity. A solid red circle represents a very strong interferer that likely disrupts Wi-Fi communications, a light pink circle represents a weak interferer.
We can see an area where the circles overlap and create what is close to a solid red circle, however the fact that each lightning bolt has a number greater than 1 this makes B the best choice as they seem to want to put emphasis on the number of interferers rather than the severity.
https://www.cisco.com/c/en/us/td/docs/net_mgmt/prime/infrastructure/3-
7/user/guide/bk_CiscoPrimeInfrastructure_3_7_0_User_Guide/bk_CiscoPrimeInfrastructure_3_7
_0_User_Guide_chapter_01001.html