In a food chain, energy flows from producers to consumers. In the provided options:
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sunflower → robin: This shows energy flowing from a producer (sunflower) to a primary consumer (robin). This is a correct flow of energy.
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human → potato: This shows energy flowing from a consumer (human) to a producer (potato), which is incorrect.
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lizard → grass: This shows energy flowing from a consumer (lizard) to a producer (grass), which is incorrect.
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ladybug → tomato: This shows energy flowing from a consumer (ladybug) to a producer (tomato), which is incorrect.
Therefore, the correct option showing the flow of energy from left to right in a food chain is:
sunflower → robin.