The correct option is
B Oh
! Well, never mind. We'll see you the day after tomorrow.
Here, we have to find the best response to the given sentence. 'I'm afraid I won't be able to come to office tomorrow' - here, 'I'm afraid' means 'I'm sorry/I regret'. What would you say if someone isn't going to come to office the coming day? Let's have a look at the options:
Option A - In case of absence, the bosses are usually not happy with the employees. 'Your boss will be pleased with you' is a not an appropriate response. Hence, option A is incorrect.
Option C - 'Still we will wait for you there' is logically incorrect, because, if a person has already conveyed that he/she isn't going to come, then waiting for them is pointless. Hence, option C is incorrect.
Option D - As options A and C are incorrect, we can't say that 'all of these' are correct. Hence, option D is incorrect.
Option B - Yes, the correct and a polite response would be - 'Oh! Well, never mind. We'll see you the day after tomorrow.' Hence, option B is the correct answer.