Final answer:
The main reason video games are becoming more expensive to produce is due to the demand for high-quality graphics and complex gameplay, which require significant investment in technology and skilled personnel.
Step-by-step explanation:
Video games are becoming more expensive to produce primarily because of c) High-quality graphics and complex gameplay. Given the technological advances, the demand for more sophisticated and visually stunning games has grown. The production of such high-quality games necessitates a greater investment in skilled personnel, advanced software, and longer development times, all contributing to increased costs. Contrary to a) Increased production efficiency and b) Growing indie game development, which would typically help to lower production costs or stem from smaller teams respectively, high-quality graphics and complex gameplay generally require larger teams and more resources. Also, d) Decreased demand for video games is not accurate, as demand for video games continues to grow, spurring on the investment into better game experiences.