Felix and Fanny Mendelssohn made their concert debuts

A. In a tavern

B. As the opening act for Beethoven

C. At home

D. In concert halls

i used D - in concert halls and that was incorrect

so i think the answer is C - at home

The correct answer option is A. In concert halls.

Explanation:

Both Felix Mendellsohn and his sister Fanny Mendelssohn Hensel were the famous music composers in the era of 19th century.

Fanny Mendelssohn was a highly competent musician but her family thought that music was not a respectable career for a young woman. So Fanny made her debut as a soloist in Felix's piano concert at a benefit concert (in hall).