Crypto6

I'm really confused and I can't find anywhere in my book that could help me find the answer to this question for my homework: You have a block element stacked on top of another block element. The upper one has a margin of 30, and the lower one has a margin of 10. How will the browser render them? A. It will use the value of the element with the smallest margin, effectively placing a margin of 10 pixels between the two elements. B. It will use the value of the element with the largest margin, effectively placing a margin of 30 pixels between the two elements. C. It will default to the first element listed, which in this case was 30, effectively placing a margin of 30 pixels between the two elements. D. It will combine the margins, effectively placing a margin of 40 pixels between the two elements. Can anyone help me out?