Proximal end of the filament of stamen is attached to the Anther, Connective, Placenta, Thalamus or petal?

Thalamus is the basal thickened part of the stem to which all floral appendages are found attached. Petals are the colored structural unit of the corolla. The placenta is the region of the wall of the ovary to which ovules are found attached. A stamen consists of anther and filament. Anther is a broad knob part of the stamen that contains two long and cylindrical microsporangia in its lobes. The middle parenchymatous tissue that joins two anther lobes together is termed as connective tissue. The proximal ends of the filament are found attached to thalamus or petals while the distal end carries anther which makes option D correct.