Which power is not given to the vice president by the united states constitution?
a. replace the president in case of death

b. preside over the senate
c. vote to break ties in the senate
d. attend diplomatic conferences

The answer is B my friend, sorry my answer is 5 days past your question!

Explanation:

The correct answer is actually "attend diplomatic conferences."

Explanation:

What authority does the vice president have you may ask?

 Other than to succeed to the presidency upon the death or resignation of a president, a vice president's only constitutional duty is to preside over the Senate. Vice presidents cannot vote in the Senate, except to break a tie, nor may they formally address the Senate, except with the senators' permission.