[1][33B. Rehabilitation allowance.

Where the business of any industrial undertaking carried on in India is discontinued in any previous year by reason of extensive damage to, or destruction of, any building, machinery, plant or furniture owned by the assessee and used for the purposes of such business as a direct result of

(i) flood, typhoon, hurricane, cyclone, earth-quake or other convulsion of nature; or

(ii) riot or civil disturbance; or

(iii) accidental fire or explosion; or