A teacher wants to see the progress of her students’ in their ability to write.
Which tool will be most reliable for her ?

Correct option is C

Portfolio.
A portfolio is a collection of student work that demonstrates their progress over time. It can include a variety of writing pieces, such as essays, poems, journal entries, and creative writing pieces. By collecting and reviewing students' portfolios, teachers can gain a comprehensive understanding of their students' writing abilities and track their progress over time.