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Choose the correct sentence: When you say so, I must take it serious., Since you say so, I must take it seriously., When you say so, I must take it seriously., None of these

Choose the correct sentence: When you say so, I must take it serious., Since you say so, I must take it seriously., When you say so, I must take it seriously., None of these

Explanation

When you say so, I must take it seriously.

"Seriously" is the correct adverb form to modify the verb "take".