Explanation:

The correct answer is A because industry-level forces, as outlined in frameworks like Porter's Five Forces, include the threat of new entrants, substitution threats, bargaining power of customers and suppliers, competitive rivalry within the industry, life-cycle issues, and business-cycle considerations. These forces directly impact the competitive dynamics of the industry.

B and C are incorrect because demographic and technological influences are categorized as macro-level forces (e.g., PESTLE framework), which affect the broader environment rather than the specific industry dynamics.