【正确答案】 B

【答案解析】To solve this problem, remember that 1/4 is equivalent to 0.25, and that 0.1 percent is equivalent to 0.001(0.1/100). Therefore, 1/4, or 0.25 of 0.001 =0.00025; do not get confused and simply find 1/4 of 0.1, (0.025) because the question asks for 1/4 of 0.1 percent.