32 empty square pieces are empty because the total number of squares in the board is 8X8 which is 64 and for the spaces filled theres 16 for each player and there are two players so its 16x2 which us 32. The total number of soaces minus the filled spaces will give you the number of empty spaces. So 64-32=32
D , because they are both completely unrelated which means one does not depend on the other. bringing an umbrella is independent from going to school knowing u have a test.