The correct option is B A depicts self pollination, while C depicts cross pollination.
Self-pollination involves the transfer of pollen grains from the anther to the stigma of the same flower or another flower of the same plant. A depicts self pollination.
Cross-pollination involves the transfer of pollen grains from the anther to the stigma of another plant of the same species. C depicts cross pollination.
In B, the transfer is between one anther to another anther. This is not pollination.