In which one of these sentences is a prefix used in an italicized word?

C. She was ungrateful for his help.

Among the sentences, this specific statement shows that the italicized word that is ungrateful uses a prefix. The prefix found in the word "ungrateful" is  "un". The prefix "un" means not therefore, ungrateful means not grateful.

This is the diary :

This School Diary is the privileged communication tool between the school and the family. It

enables the student to organise his/her activities, and the parents to regularly keep up with

their child’s school work.

The student must bring the School Diary to school and write down the homework in it. The

teachers write in the evaluation results. They can also write in information from the school, in

particular remarks about the student’s performance or behaviour, or announce special events.

Parents must sign the School Diary each week to acknowledge they have seen and read the

information. There is a space for their comments.

Particular attention should be paid to the kind, nature and number of observations written

in the School Diary. Direct dialogue enables the most complete and precise communication

regarding the pupil’s school life. Parents and teachers may ask for a meeting at any time.

The request can be made under the section called «Demande d’entretien» (Request for a

meeting).

particular general information meetings.

Classroom, institution and school rules

Each class or school is entitled to set up their own rules for community life, in accordance

with the Law on Mandatory Schooling and its Implementation Regulations. Those rules are