During photorespiration under low $CO_2$ and high $O_2$ levels, $O_2$ reacts with ribulose1,5- bisphosphate to yield
- one molecule each of 3-phosphoglycerate and 2-phosphoglycolate
- two molecules of 3-phosphoglycerate
- two molecules of 2-phosphoglycolate
- one molecule each of 3-phosphoglycerate and glyoxylate