Answer: D
Explanation:
In some cases, it's not mandatory to use a certain punctuation. Such as a comma. Here's an example.
EXAMPLE 1:
"I wish I could, but I can't."
Now, there are more ways to rewrite it.
EXAMPLE 2:
"I wish I could...but I can't."
EXAMPLE 3:
"I wish I could-but I can't."
EXAMPLE 4:
"I wish I could. But I can't"
These all work!