How did Seward change American attitudes? He added land to increase our size
He made people believe we should expand into foreign territories
He bought territory that became a huge investment
He showed how to negotiate under pressure

It is (C).

Explanation:

I did it and got it right.

Sorry if it is wrong

one of these is the rhoticity common in most american accents, because in the 17th century, when english was brought to the americas, most english in england was also rhotic.