For what fraction or percent of geologic time have land plants been present on earth

According to finding of scientist, the earth is roughly 4,600 million years old. then the non abundant fossil that they dated was about 3,600 million years old. so the fraction or percent of geologic time is :

3,600 / 4600 = 0.78 or 78 % of earth geologic time

The answer would be c

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