Concept:Formative assessment is a continuous process used by teachers to monitor student learning and provide ongoing feedback to improve teaching and learning.Explanation:Formative assessment tools are those activities or methods that help teachers understand a student's learning progress during the course of instruction. These tools are used to identify areas where students might be struggling and to adjust teaching strategies accordingly. Among the given options, 'Project work' is a well-recognized method used for formative assessment. Teachers can observe students' engagement, problem-solving skills, and understanding of concepts through project work, providing valuable feedback for their development. The other options, like conventions of writing, reading comprehension, and grammar, are specific skills or knowledge areas that might be assessed, but 'project work' itself is a broader activity that can incorporate and assess these skills formatively.Answer:C. Project work.