Lexical ambiguity occurs when?

Lexical ambiguity occurs when words have multiple meanings. This phenomenon arises because a single word can represent more than one concept, resulting in confusion regarding the intended interpretation. For example, the word "bank" can refer to the financial institution or the side of a river. Without additional context to clarify which meaning is intended, the communication may become ambiguous.

The other options relate to language but describe different types of issues. Confusing sentence structure pertains more to syntactic ambiguity rather than lexical ambiguity, as it involves the arrangement of words rather than their meanings. Metaphorical language introduces figurative meaning but does not inherently create ambiguity regarding the individual words themselves. Lastly, unclear context can contribute to ambiguity, but it is the multiplicity of a word's meanings that characterizes lexical ambiguity specifically.