; and (II) that county or the applicable region; or (ii) a comparable adjustment, as determined by the Secretary, if the factor described in clause (i) is not available. (B) Limitation A yield may not be adjusted by greater than 50 percent under subparagraph (A). (C) Use The Secretary shall not use a yield adjustment under this paragraph for purposes of subsection (c). (c) Agriculture risk coverage guarantee (1) In general The agriculture risk coverage guarantee for a crop year for a covered commodity shall equal 90 percent of the benchmark revenue described in paragraph (2) or (3), as applicable. (2) Benchmark revenue for county coverage In the case of county coverage, the benchmark revenue referred to in paragraph (1) shall be the product obtained by multiplying— (A) subject to paragraphs (4) and (5), the average historical county yield as determined by the Secretary for the most recent 5 crop years, excluding each of the crop years with the highest and lowest yields; and (B) subject to paragraph (6), the national average market price received by producers during the 12-month marketing year for the most recent 3 crop years. (3) Benchmark revenue for individual coverage In the case of individual coverage, the benchmark revenue for a producer on a farm for a crop year shall be based on the share of the producer in all covered commodities planted on all farms for which individual coverage has been selected and in which the producer has an interest, to be determined by the Secretary as follows: (A) For each covered commodity for each of the most recent 5 crop years, the product obtained by multiplying— (i) subject to paragraphs (4) and (5), the yield per planted acre for the covered commodity on those farms, as determined by the Secretary