A Cross Between a True-Breeding Sharp-Spined Cactus and a Spineless

A cross between a True-breeding sharp-spined cactus and a spineless cactus would produce

A) all sharp-spined progeny.
B) 50% sharp-spined, 50% dull-spined progeny.
C) 25% sharp-spined, 50% dull-spined, 25% spineless progeny
D) all spineless progeny.
E) It is impossible to determine the phenotypes of the progeny.