Explain the proper use of the comma to set apart nonessential elements within a sentence

Which type of conflict does della face in o. henry’s “the gift of the magi”? a. character versus society b. character versus machine c. character versus character d. character versus nature

18 points so for my assignment there need to be like conflict and stuff but i don't know where i am going with this. can somebody me out? and it needs to be turned in by 12.ring ring, ring ring… “dr. watson, hi. i have run out of blueberries at my berry shop! may you pick some up on your way here? remember, not the ones by the big pine. the ones by the creek.” “of course, sherlock! i’m on my way right now. see you soon! ” said dr. watson. beep. dr. watson always wants to impress sherlock so he made sure to leave right away to have enough time to pick through all the berries and find the best ones. it was about a 4-hour walk from dr. watson’s cottage to the berry shop, so he made sure not get distracted. about 2 hours into his walk, he started approaching the berries. however, these were the ones by the big pine that did not look very appetizing. the blueberries were so small, you could taste the sourness through your teeth. most of them weren’t even ripe yet. straight green. dr. watson turned away with his sour face and headed toward the creek. there, he saw the most beautiful berries. plump and juicy, dark blue, and so big, you could almost compare them to some grapes! as dr. watson went to pick the first berry, sherlock called. “hi! just checking in. how is it going? we have a few people who put in orders for blueberries. they will be picking them up tomorrow morning and we still need to get the blueberries through the sanitizing process.” “yes, i am going as fast as i can. i will be there soon! ”

The balance includes both the fees for service and the shipping charges. is this sentence incomplete or complete?