What approaches did camillo di cavour use to acquire more territory for piedmont-sardinia

Camillo di cavour used diplomacy and well chosen alliances to aquire land.

Camillo di Cavour wanted to unify all of the Italian peoples under one flag. One big thing stopping him from achieving this was that the French government was guaranteeing the independence of the Papal States. He gave France the primarily French speaking regions of Savoy and Nice, and in exchange France revoked their guarantee. He was a very clever and pragmatic diplomat.

the american rail road was the most influential and useful transportation system developed in the 1800's with steam locomotives and in the very late 1800's and early 1900's diesel electric locomotives being used to transport goods and people around the newly expanded united states!

i would say your answer is a)

sorry if im wrong