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Which of the explanations at the end of the sentence is...

Which of the explanations at the end of the sentence is incorrect:


A

If Paul travels, he will know many countries. (First Conditional)


B

If Paul traveled, he would knew many countries.(Second Conditional)


C

If Paul had traveled, he would have known many countries.(Third Conditional)


D

If Paul travels, he knows many countries. (First Conditional)


E

If Paul travels, ask him to come back soon. (Zero Conditional)