The correct option is D I'm afraid he is not at home
In the given dialogue, the caller 'Suharsh' has called for Mr. Solanki. Instead, 'Ritu' answers the call.
Option B: This is the most appropriate answer because 'Ritu' replies to the question by saying that the person for whom the call was intended, 'Mr. Solanki', is not at home. This reply is coherent with the next sentence 'Can I take a message.'
Hence option B is correct.
The other responses 'If you don't mind' and 'In case it is urgent' do not serve as justifiable answers to the question 'Could I speak to Mr. Solanki?'
Hence options A and C are incorrect.
Option D is incorrect because C does not serve as an appropriate response.