Option a is answer upper side of kinked demand curve shouw elastic nd below shows inelastic.

1980s, there were several major events and trends that shaped the decade. Some of these include:

1. The end of the Cold War: The 1980s saw the beginning of the end of the Cold War between the United States and the Soviet Union. This was marked by a series of arms control agreements and negotiations, as well as a thawing of tensions between the two superpowers.

2. Reaganomics: The economic policies of President Ronald Reagan, known as Reaganomics, were a major influence on the 1980s. These policies included tax cuts, deregulation, and reduced government spending, and were aimed at stimulating economic growth and reducing inflation.

3. Rise of technology: The 1980s saw a rapid advancement in technology, particularly in the fields of personal computers and telecommunications. This led to the widespread adoption of home computers and the birth of the internet, which would go on to have a profound impact on society.

4. MTV and the rise of music videos: The launch of MTV in 1981 revolutionized the music industry by popularizing the medium of music videos. This had a significant impact on popular culture and helped to launch the careers of many artists.

5. The AIDS epidemic: The 1980s saw the rapid spread of HIV/AIDS, which became a global epidemic. This had a major impact on public health and led to increased awareness and activism around the disease.

6. The fall of the Berlin Wall: In 1989, the Berlin Wall, which had divided East and West Germany since 1961, was finally torn down. This symbolized the end of the Cold War and the reunification of Germany.

7. Pop culture and fashion: The 1980s were known for their distinctive pop culture and fashion trends, including big hair, neon colors, leg warmers, and shoulder pads. Music genres like pop, rock, and new wave were popular, and iconic films like "Back to the Future" and "E.T. the Extra-Terrestrial" were released.

Overall, the 1980s were a decade of significant social, political, and cultural change, with the end of the Cold War, advancements in technology, and the rise of popular culture all leaving a lasting impact on society.