During a Late-Summer Walk Through a Park, You Notice a Tree

During a late-summer walk through a park, you notice a tree that has remnants of many flowers but no fruits or seeds developing. There are no other trees like this one in the area. What could explain this occurrence?

A) It is a female tree, and there are no known male trees of the same species in the area.
B) It is a male tree with only male flowers that produce pollen, but no seed, and hence does not form fruit.
C) It is actually a gymnosperm, not an angiosperm.
D) It is a species that reproduces only by runners, not via fruits (or the seeds they contain) .