The question asks for the approximate population of humans on Earth currently and provides four options:
1. 3 billion
2. 1 billion
3. 6 billion
4. 60 billion
To find the correct answer, we need to select the one that most accurately reflects the current human population.
- Option A suggests a population of 3 billion. Historically, this number was accurate around the mid-20th century, but it is significantly lower than modern estimates.
- Option B suggests a population of 1 billion. This number was accurate in the early 1800s, making it outdated by current standards.
- Option D suggests a population of 60 billion. This figure is highly exaggerated and not realistic given known historical and current data.
Option C, which indicates a population of 6 billion, is the most accurate and up-to-date estimate. The current approximate population of humans on Earth is indeed about 6 billion.
Thus, the correct answer is:
C. 6 billion
