"The women are tall."
w is never capitalized in proper Okrandian Klingon. However, the Duolingo software has some built in quirks. One of them is that it always recapitalizes all the answers when it creates that type of multiple choice exercise. Theoretically the programmers will try to fix it, but it is very low priority for them.
Unfortunately, only the moderators and contributors follow this specific forum and they have already informed staff of this problem. If you would like to express your concern to the staff in hopes they will upgrade the priority, the only way I know of to complain to the administration about problems with the programming of the course is to file a bug report: https://support.duolingo.com/hc/en-us/articles/204728264-How-do-I-report-a-bug- Including a screen shot is very helpful.