URGENT PLEASE HELP NOW!! When do most ionic bonds form, based on this Periodic Table?

when elements from B bond with themselves

when elements from A bond with elements from B

when elements from C bond with elements from D

when elements from A bond with themselves

The human activities in two locations are described below: location a: rampant use of plastic containers location b: excessive use of pesticides and fertilizers which statement is most likely true? location a will have poor air quality because plastic is biodegradable. location a will experience water scarcity because plastic absorbs moisture. the population of honeybees will increase in location b because production of crops will increase. the population of fish in location b will decrease because the water is contaminated.