Final answer:
The component of an argument found in the sentence "Parents looking for their child's first pet should choose a goldfish" is the claim.
Step-by-step explanation:
In the sentence "Parents looking for their child's first pet should choose a goldfish," the component of an argument that is found is the claim. A claim is a statement that something is true or that some action should be taken. In this case, the claim is that parents should choose a goldfish as their child's first pet.