Such features could be telco specific. Perhaps your telco doesn't support delivery reporting. And if Sprint runs custom firmware, they could just remove that.
Your best bat is to talk to Sprint support and find out. Most of us have this by default, and there is no toggle option to remove it or place it within the Setting - Menu list.
Just to double check:
Open Messaging app, go to Settings. The checkbox is a 5th position from the top. Not there, call Sprint.