What is the impact of motivation on vocabulary acquisition?

The impact of motivation on vocabulary acquisition is significant because motivated learners actively engage with the material, increasing their investment in the learning process. When learners are motivated, they are more likely to explore new words and their meanings thoroughly, leading to deeper understanding and retention. This engagement often involves using vocabulary in various contexts, thereby enhancing their ability to recall and apply the words later.

Research has shown that motivation can lead learners to take additional steps in their learning, like seeking out challenging texts, participating in discussions, or practicing vocabulary in meaningful ways. These actions contribute to a more profound grasp of vocabulary and its nuances, which is essential not just for immediate comprehension but for long-term retention.

Other choices suggest a lack of significant influence of motivation on learning or limit its effects to specific areas, such as passive learning or reading speed. However, the broader and more enduring impact of motivational factors is what makes option C the most valid, as it encompasses the full spectrum of vocabulary learning and retention.