The gynoecium is the female reproductive part of a flower, which includes the pistil, stigma, style, and ovary. The pollen grains germinate and their tubes grow through the gynoecium to reach the ovule for fertilization.

In option 1, the correct order is not followed. The style should come before the stigma.

Option 2 is the correct answer. The pollen tube pathway/journey starts with the stigma, then goes through the style, and finally reaches the ovary. This is the correct sequence of the parts of the gynoecium that the pollen tube traverses.

Option 3 is not correct because the pistil is a collective term for the entire female reproductive part of the flower, not a specific part along the pathway of the pollen tube.

Option 4 is not correct because the ovary is the basal part of the pistil, and the style comes between the ovary and the stigma.

Therefore, the correct answer is option 2. The correct sequence of the parts of the gynoecium that the pollen tube passes through is Stigma, Style, Ovary.