When we salivate because food is being presented to us then this is an example of D. a reflex.
Why do we salivate when food is brought?
The reason humans - and indeed all animals - salivate when food is brought is because the mouth is getting ready to initiate the digestive process.
This makes salivation a reflex action that we don't really have control over as our body is simply acing in the way it has evolved to.
In conclusion, salivation is a reflex action.
Find out more on reflex actions at https://brainly.com/question/3325521
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