Which revision best corrects the faulty parallelism in the sentence?

[Anonymous]

Baking a cake is easy, but muffins are hard.

Which revision best corrects the faulty parallelism in the sentence?


Cake and muffins are easy and hard.
Cake is easy, but baking muffins is hard.
As far as baking muffins, they are hard but cakes are easy.
Baking a cake is easy, but baking muffins is hard.

[KDA20]

I would say baking muffins is more difficult to avoid confusion.

[Rahdle]

The last one for sure. It's the only clear and complete sentence

[Anonymous]

Well, the first one looks fine to me, but if I had to choose... The 4th one.