Which of the following correctly describes when plants began to colonize early earth?
a. after the dinosaurs went extinct
b. before prokaryotes first dominated the earth
c. directly before the age of reptiles
d. before eukaryotes grouped together to form multicellular organisms

Plants began to appear around 470 million years ago.  Dinosaurs became extinct about 65 million years ago, so thats not a choice.  Prokaryotes first appeared on Earth almost 2 billion years ago, so thats not a choice either.  Age of the Reptiles began about 252 years ago, so this could be a choice. Eukaryotes formed around 1.5 billion years ago, so probably not a possible choice.  Based of the data I provided you, C is the most likely answer.  Hope this helps!