Final answer:
A Pennsylvania State Senate candidate who believes in expanding social welfare programs and protecting the environment would be most likely to succeed in Region 1, which consists of urban areas like Philadelphia and Pittsburgh.
Step-by-step explanation:
Based on the given map, a Pennsylvania State Senate candidate who believes in expanding social welfare programs and protecting the environment would be most likely to succeed in Region 1.
Region 1 is predominantly made up of urban areas such as Philadelphia and Pittsburgh. These areas tend to have a larger population, diverse demographics, and a higher concentration of individuals who may support expanding social welfare programs and protecting the environment.
In contrast, the other regions include more rural and suburban areas, which may have different priorities and values.