The correct option is A Stigma, ovule, embryo sac, placenta
Stigma is a part of pistil on which pollen grain lands. Each ovary may have many ovules, which have embryo sacs in them. Placenta is a tissue/ridge inside ovary to which ovules are attached.
Thalamus is the terminal part of the axis of flower which bears all floral appendages. Tapetum is the innermost layer of microsporangium while stamen is part of androecium.