One key benefit of using online quizzes for formative assessment is:

Using online quizzes for formative assessment significantly enhances the learning process through the provision of immediate feedback and the promotion of self-paced learning. This immediate feedback allows students to quickly understand their strengths and weaknesses in a particular subject area. When students receive real-time results, they can identify which concepts they have mastered and which ones require further study, facilitating a more tailored learning experience.

Additionally, online quizzes can be taken at a student's convenience, allowing them to learn at their own pace. This flexibility can lead to an increased motivation to engage with the material, as learners can spend more time on challenging topics or accelerate through areas they find easier. Such self-regulated learning is crucial in modern educational environments, as it encourages learners to take ownership of their education and adapt their study habits according to their individual needs.

In contrast, the other options suggest aspects that do not align with the primary benefits of online quizzes. Some may take longer to complete due to various factors, instructor involvement remains essential for guiding and interpreting results, and while the quizzes can standardize assessments to an extent, they do not necessarily eliminate variability in student responses. Thus, the opportunity for immediate feedback and the chance to learn at one's own pace stand out as the strongest advantages of using online quizzes in formative assessment.