The assertion (A) is true because manufacturing industries indeed rely on raw materials for production. Raw materials serve as the essential input for creating finished products. However, the reason (R) is also true because resources, including raw materials, are essential for human survival. Despite this, (R) does not directly explain (A) because the necessity of resources for survival is a broader concept that includes not just raw materials, but also other types of resources such as energy and water. Therefore, the reason (R) is true but does not directly explain why all manufacturing industries are associated with raw materials.