The first two pictures look like rubber trees. The first ones looks slightly varigated. Give them a sunny window and water them more often.

That last one looks like "Wandering Jew" a Zebrina species.

Nancy

Thank you both.

Zackey- they are actually currently outside on a North-facing patio. Is it better to keep them inside, at a window?

Nancy- thanks! I was actually referring to the green leaf in the last pictures. I honestly have no idea how wandering jew started growing in that pot, however! haha. I plan on repotting those soon though :)

Im no expert but B looks like a pepperomia

I think A and B look like Ficus elastica. I would encourage you to inspect the bottom of the yellowish/spotty leaves to see if there are spider mites. They can be removed by wiping the leaves with a cotton ball soaked in rubbing alcohol.

I definitely agree the first two are rubber plants/Ficus elastica.
Not sure about the last one. The leaf color/shape sort of reminds me of the immature leaf of a coffee plant but the trailing/floppy habit is all wrong for that.
Where did you get these from? Am I correct in assuming the person who sold or gave them to you had no idea what they had as well? If you had a list of what was supposed to be in the package then it would narrow things down.

Thanks again everyone!

Purpleinopp- The one leaf that was yellowing has gotten significantly worse and even browned in several spots. I'm not too sure what to look for when checking for spider mites, but I did see a couple of tiny, raised brown flecks that came off when I wiped the leaf with an alcohol swab. I also wiped the main stem of the plant and the other leaves, too. If it looks like it may be spider mites to you just from that picture, I'm going to assume that's what it is. I looked at several other plants that are being kept with this one, and they seem to be affected too. None have lost any leaves, however. If that's the case, I've got looots of leaves to wipe down!

Summersunshine- I actually purchased these plants through a seller on amazon. It was listed as a "random assortment of houseplants". I received a list of potential plants that I would be getting, but after googling each of them, none of them were even close to being accurate, and I've clearly identified plants I received that weren't even on the list at all. At this point, I'm wondering if somehow the packaging forced this plant to grow all bent and it really is not supposed to be like that at all?