The initial sentence is in direct speech, using the present perfect tense: “I have completed…”. When changing to indirect speech, the tense typically moves back one step: - Present Perfect (\textit{have completed}) \(\Rightarrow\) Past Perfect (\textit{had completed}). Additionally, the pronoun “I” becomes “she” (because the speaker is “she”). Thus, the correct transformation is: \(\Rightarrow\) “She said that she had completed her assignment on time.” \boxed{\text{Correct Indirect Speech: She said that she had completed her assignment on time.}}