Why is the cross significant in Christianity?

the cross is the main symbol. It reminds Christians that Jesus died on the cross to save them. The dove is the symbol of the holy spirit and peace.

Explanation:

In Christianity the cross reminds Christians of God's act of love in Christ's sacrifice at Calvary—"the Lamb of God who takes away the sin of the world." The cross also reminds Christians of Jesus' victory over sin and death, since it is believed that through His death and resurrection He conquered death itself.

the fact that could also be added to column b is that during world war ii, specifically between the years 1941 and 1945, japan expanded its territory towards the indonesian territory in what was known later as part of the "pacific war". in that time, japan could conquer the philipines, singapore,   borneo, central java, malang, cebu, sumatra and various other islands of the area, therefore expanding its territory for a brief period of time.