Final answer:
Syntax and semantics are both important aspects of language. Semantics must be present to form a true sentence, while syntax is not sufficient on its own. It can be challenging to describe the syntax of one's native language to a non-native speaker.
Step-by-step explanation:
Syntax and semantics are both important aspects of language. Syntax refers to the arrangement of words and phrases to create well-formed sentences, while semantics refers to the process of deriving meaning from words and morphemes. It is true that both syntax and semantics are necessary to form a true sentence. In option c, it correctly states that semantics, or meaning, must be present in order to form a true sentence, while syntax, or grammar, is not sufficient on its own.
An example of the importance of syntax can be seen in the phrase 'To thine own self be true' from Hamlet, where the syntax is purposely manipulated for rhetorical effect. Additionally, it can be challenging to describe the syntax (word order) of one's native language to a non-native speaker, as highlighted in option b.
Therefore, the correct answer is c) semantics, or meaning, must be present in order to form a true sentence. syntax, or grammar, is not necessary.