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A link is an explained connection between the particular object and your chosen prompt. Identify which features or circumstances the explanation depends on, so the reader can follow the connection you are making.
If the third justification only repeats that the object relates to the prompt, revisit its contribution. You could draft that justification first during revision, but there is no required order for writing the commentaries.
A constructed illustration for analysis uses a label beside one exhibit in a local museum. It states the object's origin as settled fact in two sentences, without crediting a source. This supports a claim about how that label presents historical knowledge. It cannot by itself establish how all museums work or whether visitors believed the account.
Read the link aloud and note where you need extra information to follow it. Is the relevant context missing, or have you left the step from the object's feature to the knowledge claim unstated?
The problem is an unexplained connection, not overlap by itself. Name the aspect of the selected prompt that your object helps you investigate and support that connection through its details.
For an optional planning exercise, make notes on the object's relevant features, your claim about the prompt, the reasoning that connects them and the object's contribution to the exhibition. Investigate whichever part you cannot support, then integrate the explanation into your commentary in a form that suits it.