Final answer:
There could be several reasons why she was unable to speak German on the radio. One possibility is that she may not have been fluent in the language or may have lacked confidence in her ability to speak German fluently.
Step-by-step explanation:
There could be several reasons why she was unable to speak German on the radio. One possibility is that she may not have been fluent in the language or may have lacked confidence in her ability to speak German fluently. Another reason could be that she preferred speaking English over any other language, including German. Gerda may have had a stronger command of English, felt more comfortable expressing herself in English, or simply enjoyed using English more.