I received a PM asking me to comment about the placement of a comma here.

Please remember to write out the text of problems; don't use images unless the problem contains a diagram that cannot be displayed in any other way. When we hit "reply" to answer the question, we cannot see any images in the "topic review" section at the bottom of the "post a reply" screen - so we can't see the question!

Generally speaking, commas aren't tested on this exam, so don't choose or eliminate something solely based on comma placement.

You can use commas to tell you what the question writer intended in terms of sentence structure. For example: She went hiking, swimming, and boating. The "comma and" structure in this case indicates a list. Obviously the sentences will be a lot longer / more complex on the official test, so a "comma and" setup can remind you to check and see whether you have a list that you may have missed. (This is just one way in which I might use comma placement to figure out what's being tested.)

If you'd like me to go into more detail with this particular problem, please type out the problem and I'll be happy to pick this one apart!