Select the most appropriate option to substitute the underlined segment in the given sentence. If there is no need to substitute it, Select No improvement.Australia had to deploy the army to tackle the devastating floods that inundate homes, schools and airports in the country's northeastern part.

• A. the devastating floods what inundate homes
• B. the devastating floods that were inundating homes
• C. the devastating floods that inundated homes
• D. No improvement