Final answer:
The closest synonym for 'ensure' is 'provide'.
Explanation:
Ensure means to make certain that something will occur or be the case. In the given list of synonyms, the closest word to ensure is provide. When you provide something, you are making sure that it is given or available, thus ensuring its presence.
Learn more about synonyms and vocabulary here:
https://brainly.com/question/39008504
