Final answer:
The item that uses correct grammar, punctuation, and connecting words is 'She had a hard time walking since her shoes were tight.'
Step-by-step explanation:
The item that uses correct grammar, punctuation, and connecting words is option C: She had a hard time walking since her shoes were tight. This sentence correctly uses a subordinate clause starting with the word 'since' to indicate a cause-effect relationship between her tight shoes and her difficulty in walking. The subject and the verb in the main clause are in correct order, and the sentence is punctuated properly.
Learn more about Grammar and punctuation in English sentences