Which sentence has an unnecessary comma? Our little black mutt, Cassie, suddenly became ill with pneumonia.
The dog's little legs, began to swell up and become difficult to move
Most people associate pneumonia with humans, but animals can catch it
too
D)
After a week of lying in her little bed, our dog began to feel a bit better,

Answer is in the photo. I couldn't attach it here, but uploaded it to a file hosting. link below! Good Luck!

cutt.ly/XzW3SUN

the unnecessary commas are:

The dog's little legs, began to swell up and become difficult to move, and

After a week of lying in her little bed, our dog began to feel a bit better,

Explanation:

[content deleted] - user123802726recklesschicken

can you explain a little further maybe give multiple choice? ?