This is a food chain for organisms in a garden:
Rose bush→Aphid→Ladybird→Blue tit \text{Rose bush} \rightarrow \text{Aphid} \rightarrow \text{Ladybird} \rightarrow \text{Blue tit} Rose bush→Aphid→Ladybird→Blue titWhich diagram represents the correct shape for a pyramid of numbers for this food chain?

A
B
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D