Final answer:
The northern part of the Brandt Line is considered wealthy due to a higher GDP and advanced industrialization, which are indicative of developed economies with high living standards and economic prosperity.
Step-by-step explanation:
The Brandt Line is a concept that describes the division of the world into the wealthier North and the poorer South. The northern part is considered to be wealthy for several reasons. Firstly, countries in the northern hemisphere such as the United States, Canada, and European Union countries generally have a higher Gross Domestic Product (GDP), which is a measure of a country's economic activity and wealth. High GDP is often associated with developed economies that have diversified industries and high productivity. Secondly, these northern countries typically exhibit a high degree of industrialization. This level of industrial development correlates with advanced technology, a skilled workforce, and a robust infrastructure, all of which contribute to higher living standards and economic prosperity.
Therefore, the correct answer to the student's question would be (a) Wealthy; higher GDP and industrialization.