According to Mendelian genetics, certain traits are dominant over others. In the options you've provided, related to the classic pea plant experiments conducted by Gregor Mendel :

1. Option A - Green colour in seed coat : In Mendel's experiments, the yellow seed coat was the dominant trait over the green seed coat.
2. Option B - Wrinkled seed : Smooth or round seeds were dominant over wrinkled seeds.
3. Option C - Terminal position of flower : This refers to the position of the flower on the plant. Flowers at the end of the stem (terminal) were recessive compared to flowers along the stem (axial).
4. Option D - Green pod colour : Green pod colour was indeed a dominant trait over yellow pod colour in Mendel's experiments.

Based on this, the character showing dominance among the options is Option D - Green pod colour.