This question is incomplete. Its full version is:
Sara and Paul couldn't believe how many different butterflies they saw out at the lake. They saw _______.
What is the correct way to write the missing part of the sentence above?
A. lots of, monarchs, a couple of viceroys some red admirals and, even a painted lady!
B. lots, of monarchs a couple of viceroys, some red, admirals and even a painted, lady!
C. lots of monarchs, a couple of, viceroys some red admirals and even, a painted lady!
D. lots of monarchs, a couple of viceroys, some red admirals, and even a painted lady!
The right option is D.
Option D is the one with the correct use of the comma. When enumerating, we separate each part of the list with a comma, and the last item should be preceded by "and".