Read the following sentence, which contains grammatical errors:
Crater Lake was formed 7,700 years ago Mount Mazama erupted and
collapsed leaving a basin that eventually filled with water.
Which revision best corrects this sentence?
Select one:
O
Crater Lake was formed 7,700 years ago and Mount Mazama
erupted and collapsed leaving a basin, that eventually filled with
water.
Crater Lake was formed 7,700 years ago when Mount Mazama
erupted and collapsed, leaving a basin that eventually filled with
water.
Crater Lake was formed, 7,700 years ago Mount Mazama erupted
and collapsed leaving a basin, that eventually filled with water.
Crater Lake was formed 7,700 years ago, Mount Mazama erupted
and collapsed, leaving a basin that eventually filled with water.