In 1985, the world's first ammonia-free haircolor was invented.

• A. 1975
• B. 1990
• C. 1985
• D. 1980

Answer: (C)

The main idea here is understanding the specific year tied to the invention. The statement claims that the world's first ammonia-free haircolor was invented in 1985, so the correct choice is the year that matches that claim: 1985.

Ammonia-free formulas arose as a safer alternative to traditional ammonia-based developers, aiming to reduce odor and scalp irritation while still allowing color to develop. In the mid-1980s, formulators began using alternatives like monoethanolamine and other milder agents to achieve the same coloring effect without ammonia. That historical development is why 1985 is recognized as the year of the first ammonia-free haircolor invention. The other years don’t align with the event described, so they aren’t correct.