When the cells undergo late apoptosis, the membrane structure is destroyed and the nuclear structure can be selectively visualized by Hoechst 33342/PI.
https://www.creative-bioarray.com/support/double-staining-apoptosis-assay-hoechst33342-pi.htm
So following the octet rule, carbon atom can only form a maximum of 4 bonds because, by then, it will have 8 valence electrons.
Answer:
C.
Event A represents volcanic eruption and Event B represents creation of mountain ranges.
Sorry if it's wrong :(