Which composer of 'Pictures at an Exhibition', originally a piano suite later orchestrated by Ravel, was a member of 'The Five' and struggled with alcoholism?

• A Alexander Borodin
• B Mily Balakirev
• C César Cui
• D Modest Mussorgsky ✓

Mussorgsky's 'Pictures at an Exhibition' (1874) was inspired by a memorial exhibition for his friend, the artist Viktor Hartmann; most of his works were completed and edited by others after his death.