SAT Inferences Question

A soil's microbial community(the microbial taxa present in their relative abundances) is known to affect plants'cyclical processes.Corrine Walsh and colleagues hypothesized that microbial communities could also affect plants'flavor chemistry, including volatiles and secondary metabolites like glucosinolates.Recognizing that soil moisture varies by location in the wild and could influence plants'chemistry, Walsh et al.introduced distinct microbial communities to individually potted mustard plants(Brassica juncea)growing in a controlled environment,then measured the plants'glucosinolates,like butenyl and allyl (the most prominent),that create the spicy and bitter flavors in mustard.This method thus enabled the researchers to Which choice most logically completes the text?