Help with this passage

[adityaumeshacharya]

Hi, could someone please help me identify the conclusion of the below passage. I thought the last line is the conclusion of the passage but it is not as I got a question wrong based on that.

[HoldMyBeer]

Author introduce two theories highlighted in blue and red respectively as a source of UHECRs and then rejects both of them.

[adityaumeshacharya]

Cool, got it… thanks