Question

which part of the flowers pistil will pollen travel through to reach the ovary?
stamen
sepal
filament
style

Explanation:

The stamen is the male reproductive part of the flower, not part of the pistil. The sepal is a protective part of the flower bud. The filament is part of the stamen (holds the anther). The style is the part of the pistil (female reproductive part) through which pollen travels to reach the ovary.

Answer:

style