Answer :

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 This number was accurate in the early 1800s, making it outdated by current standards.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

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