Select the correct option for $X$ and $Y$ in the chart shown below.
[Chart Structure: Primitive Reptiles -> (Sauropsids,$X$); $X$ -> $Y$; $Y$ -> Therapsids]
[Chart Structure: Primitive Reptiles -> (Sauropsids,$X$); $X$ -> $Y$; $Y$ -> Therapsids]
- A$X-$ Synapsids,$Y-$ Pelycosaurs
- B$X-$ Synapsids,$Y-$ Thecodonts
- C$X-$ Thecodonts,$Y-$ Synapsids
- D$X-$ Thecodonts,$Y-$ Pelycosaurs
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