In Dianthus, placentation is
Basal
Free central
Axile
Marginal
B.
Free central
In free central placentation, the syncarpous gynoecium is unilocular and the placenta are borne on a central column formed by an extension of the base of the gynoecium where the carpels fuse or the suppression of septa. e.g. Stellaria, Dianthus