Which passage has been correctly edited for capitalization, punctuation, and spelling?

They saw a turtle in Burke lake on Monday. Theyd never seen one befor.


They saw a turtle in Burke lake on Monday. They'd never seen won before.


They saw a turtle in Burke Lake on Monday. They'd never seen one before.


They saw a turtle in Burke Lake on monday. Theyd never seen one before.


they saw a turtle in Burke Lake on Monday. They'd never seen one before.