We are writing a biography and we need to spell one French idiom correctly. This idiom was used by a very old Russian lady who spoke fluent French (she was born before 1900) who used to say it when she couldn't find a book in her library (she had over 3,500 books). She would look for a book and then say, "Blah, blah, blah" and then would translate the idiom in Russian - "inconvenience from having too much stuff" or "inconvenience from being too rich".
a. L'Embarras des richesses (capital L and E)
b. embarras des richesses (no capitals)
c. L'embarras des richesse (lower case e) - I tried google pronunciation, it sounds like it
d. L'embarras de la richesse