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a. Either answer can be correct, depending on how you argue your case.

b. Either answer is correct, depending on how you argue your case.

c. Both answers can be correct, depending on how you argue your case.

d. Both answers are correct, depending on how you argue your case.

May I please have the differences in meaning?

Thank you
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To me, (b) and (d) are illogical. "Is correct" and "are correct" are absolutes.

She is pregnant, depending on how you look at it.

A sentence like this is playing with the meanings of the words.
The defense would be, "Well, if you etc. etc."

On the other hand, you could say, "both answers are correct if you assume blah blah . . . "

"She will win, depending on how hard she tries," is a grey area.
Comments  
AvangiTo me, (b) and (d) are illogical. "Is correct" and "are correct" are absolutes.

That's what I was looking for, Avangi. Good answer, thanks.
Avangi
She is pregnant, depending on how you look at it.

A sentence like this is playing with the meanings of the words.

True, as in how you define the term 'pregnant.'

What about the differences between a and c?