Alice is in business as a sole trader. On 13 May 2014, she sold a freehold warehouse for £184,000, and this resulted in a chargeable gain of £38,600. Alice purchased a replacement freehold warehouse on 20 May 2014 for £143,000. Where possible, Alice always makes a claim to roll over gains against the cost of replacement assets. Both buildings have been, or will be, used for business purposes by Alice.

What is the base cost of the replacement warehouse for capital gains tax purposes?

A. £181,600
B. £104,400
C. £143,000
D. £102,000