In the following sentence, a part of the sentence is underlined. Below are given alternatives to the underlined part, which may improve the sentence. Choose the correct alternative. In case no improvement is needed, choose the alternative that indicates 'No improvement'.

President Ram Nath Kovind, who is in Kanpur, stayed at Agarwal house for more than one hour.

A. Agarwal house since more than one hour.

B. Agarwal's house for more than one hour.

C. Agarwal's house since more than one hour.