Which sentence is most clearly written?

The sentence that is most clearly written provides a straightforward description of the child's desire for toys without any ambiguity. It highlights that the child is influenced by commercials, emphasizing the desire to own items he has only seen advertised. The use of "the toys" in reference to the things he wanted is somewhat vague since the context does not provide a direct link between "the toys" and the commercials, which could lead to confusion about whether 'the toys' specifically refers to the items he saw advertised.

On the other hand, the other option specifies "they," which directly refers back to the toys advertised in the commercials, creating a clearer connection for the reader. This enhancement of clarity helps convey the child’s desire more effectively and reinforces the idea that he seeks what is being marketed, despite lacking clarity on what those toys actually are. The precision in pronoun use elevates the clarity of the second option overall.