Earth probably formed years ago, and the first life evolved as early as years ago. hint: because fossils of bacterial communities have been discovered that are 3.5 billion years old, it is reasonable to assume life originated around 3.9 billion years ago.
a. 3.9 million years ago 2.0 billion years ago
b. 10 billion years ago 4.5 billion years ago
c. 4.5 billion years ago 3.9 billion years ago
d. 6,000 years ago 6,000 years ago
e. humans observed neither event, so there is no way to tell.

c. 4.5 billion years ago ... 3.9 billion years ago.

Explanation:

The origin of the earth dates back to the time when the universe was formed and the formation of ll large star as the sun which itself is about 4.6 billion years old.  And all this took place by the acceleration of the solar nebula disk, volcanic degassing and solar storm responsible for the creation of the secondary atmosphere in the earth that made life possible and thus oxygen was developed and gave rise to many species on earth. The origin of the life forms on the earth in form of the single-celled microorganism took place in the hydrothermal vents in the oceans and they lived as 4.28 billion years ago, and this was relatively soon after the ocean formed around 4.41 billion years ago.

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