Which line from the decree in The Riddle of the Rosetta Stone best supports the idea that Ptolemy was a fair and kind ruler? he provided that cavalry and infantry forces and ships should be sent out against those who invaded Egypt by sea and by land,
and whereas those who were in prison and those who were under accusation for a long time, he has freed of the charges against them;
Whereas King PTOLEMY, the son of King Ptolemy and Queen Arsinoe, has been a benefactor both to the temples and to those who dwell in them
in return for which things the gods have given him health, victory, and power, and all other good things, and he and his children shall retain the kingship for all time.

And whereas those who were in prison and those who were under accusation for a long time, he has freed of the charges against them.

Explanation:

The Riddle of the Rosetta Stone is a book written by James Cross Giblin. It tells about how the discovery and deciphering of the Rosetta Stone impacted egyptology by teaching scientists how to read the Egyptian hieroglyphics.

The line that supports the idea that Ptolemy was a fair and kind ruler is the second one. He decided to spare prisoners and the accused, freeing them and dropping the charges against them. He decided to give people a chance to redeem themselves, which is a kind gesture.

The rest of the lines don't reveal this trait of king Ptolemy, which is why they are not correct.