Here are the answers to your questions:
Question 1: A) Balance is the way the elements of art are arranged to create a feeling of stability in a work.
Question 2: A) Formal balance in which one half of a piece of art mirrors exactly the other half is called symmetrical balance.
Question 3: A) Radial balance occurs when objects are positioned around a central point.
Question 4: A) Variety is a way of combining elements to stress the differences between those elements.
Question 5: A) Harmony is the relationship of elements to each other and to the work as a whole.
Question 6: A) Emphasis occurs when similar elements are combined in a way to accent their similarities.
Question 7: A) Variety has an effect opposite to that of harmony.
Question 8: A) Asymmetrical balance is informal balance in which each side of an imaginary line is different but equal.
Question 9: A) Movement refers to implied motion.
Question 10: A) Rhythm is a visual tempo/beat that is created by the placement of repeated elements within a work.