The question asks about the term used to describe the lack of appropriate cultural resources such as language and knowledge. Let's examine each option to understand which one matches this definition:

1. Cultural Materialism: This is a theoretical framework in anthropology and sociology that focuses on the material aspects of culture such as economic and environmental factors in understanding societal structures and practices. It does not specifically address the lack of cultural resources, hence it is not the correct answer.
2. Cultural Deprivation: This term refers to the absence or lack of certain cultural resources, such as language skills and educational opportunities, which are necessary for an individual to succeed in society. This directly aligns with the concept described in the question, making it the correct answer.
3. Cultural Trait: This refers to a single element of normal practice in a culture, such as a habit, custom, or value. It is not related to the lack of cultural resources, so this option is incorrect.
4. Cultural Pluralism: This concept refers to a society where different cultural groups maintain their unique cultural identity while participating equally in the dominant culture. It is a concept of coexistence, not related to the lack of resources, thereby making this option incorrect.

Based on this reasoning, the term that correctly describes the lack of appropriate cultural resources like language and knowledge is Cultural Deprivation. This concept is significant in understanding social inequality and the barriers certain groups face in accessing cultural capital needed for social mobility.