In the list of evolutionary events, we can see that their logical sequence is:
0. First prokaryotic cells evolved
,
1. Photosynthetic prokaryotes evolved, producing O2
,
2. First eukaryotic cells evolved
,
3. First multicellular life evolved
This means the options are in chronological order and we only need to order the age from oldest to the most recent one:
0. 3.5 billion years
,
1. 2.8 billion years
,
2. 2.1 billion years
,
3. 650 million years