Final answer:
Joel's gang, being profit-driven, is most likely involved in drug trafficking, as it is a highly lucrative activity historically linked to organized crime and gangs.
Step-by-step explanation:
Given the large inner-city gang's desire for large profits, Joel's gang is most likely to be involved in c) Drug trafficking. This activity stands out among the options as it is known for generating significant revenue. Historical and contemporary examples illustrate that organized crime syndicates, including gangs, have engaged extensively in the drug trade due to its profitability. The illegal drug market has been a major source of income for gangs, particularly given its extensive demand and the potential to make vast sums of money. Other criminal activities such as petty theft, vandalism, or disorderly conduct generally yield much less financial reward and are less likely to be the focus of a gang primarily motivated by profit.