The answer is “I”.
“His” is 3rd person
“It” is 3rd person
“Your” is second person
Best of all, are the days we go horseback riding
Umm.. Any site ending in .Gov or .Edu
Encyclopedia
Books written in depth on the subject
Any written or spoken words from creditable people who study\mastered the subject
Hope this helps.
The population of Marsh grasses might increase if the population of Herons decrease because the herons use the marsh to live in and potentially eat. I hope this helps