Which of the following code blocks returns a new DataFrame where the column productCategories contains only one word per row, resulting in a DataFrame with significantly more rows than the original storesDF?

A sample of storesDF is shown below:

storeId  productCategories
0        [netus, pellentes...]
1        [consequat enim,...]
2        [massa, a, vitae,...]
3        [aliquam, donec...]
4        [condimentum, fer...]
5        [viverra habitan...]