Which of the following is a physical change?
ⓐsaw a piece of wood in half
ⓑburn a piece of wood
ⓒrust formed on an iron fence
ⓓa copper roof that changes color from red to green

According to robert kennedy, how might the historian see 1962a. as a year of resistance by the southb. as a year of great progress in civil rightsc. as a year of rioting and violenced. as a year of resegregation