Select either Yes, No, or Don't Know (needs more info) for the following algorithms

Circle whichever applies to the following: A) Quicksort is asymptotically faster than bubblesort - b) Quicksort is asymptotically slower than mergesort - c) To sort 8 numbers it is necessary to make at least d) To find 2 heavier coins among 14 same coins using lever scales it is necessary to make at least e) To find 2 heavier coins among 15 same coins using lever scales it is necessary to make at least f) Given set S of points in the Euclidean plane, Voronoi graph of S always g) Given set S of points in the Euclidean plane, convex hull of S always