Piedmont-Sardinia was Italy’s largest independent State. Therefore, there were a strong

Supporter of Italian unification.

Explanation:

In the years prior the Italian unification, Piedmont-Sardinia was the strongest Italian independent state, not only in military strength, but also in economic strength, since it was the first region of Italy to industrialize.

This is why it was Piedmont-Sardinia the region that led the Italian Unification process. This process advanced from North to South, and many other regions resented Piedmont-Sardinia for it even decades after Italy had become an independent country.

i dont believe in religion. lets all be peace

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."