Correct answer looks like to me would be A. Because, if a sunflower has 34 chromosomes, when you split it up into x and y chromosomes, there will be 17 x chromosomes and 17 y chromosomes. Hope this helps!
A. is your correct answer
Phylogenetic bracketing is a technique for surmising utilized as a part of organic sciences. It is to deduce the probability of obscure attributes in life forms in view of their position in a phylogenetic tree. One of the primary utilizations of phylogenetic sectioning is on wiped out creatures, known from fossils.