The given sentence has been broken up into four different parts. The error, if any, will be in one or more parts of the sentence. Select the option that contains the part of the sentence which is free from an error. If all are incorrect choose ‘Option 5’ as your answer.

Although he was not doing well as (A) in his business instead he tried his best (B) to make his sister happy (C) by gifting her a BMW on her birthday. (D)