Concept:To compare decimals, write them with the same number of decimal places, or multiply each by the same power of 10 to get whole numbers.Explanation:Write each decimal with three decimal places:0.301=0.301, 0.3=0.300, 0.33=0.330, 0.03=0.030.Compare the tenths digit first. Only 0.030 has 0 in the tenths place, so it is the smallest.Now compare 0.300, 0.301, and 0.330.The hundredths digit of 0.330 is 3, which is greater than 0, so 0.330 is the largest.Between 0.300 and 0.301, compare the thousandths digit: 0<1, so 0.300<0.301.Therefore, the ascending order is:0.03<0.3<0.301<0.33.Answer:Option A: 0.03,0.3,0.301,0.33