Concept:To arrange decimals in ascending order, first compare the whole number part, then compare digits from the tenths place onwards.
Explanation:List the numbers: 7.07, 7.70, 7.707, 7.007, 0.77.
The smallest whole number is 0, so 0.77 comes first.
Among the remaining numbers, all have whole part 7. Compare the tenths digit: 7.007 has 0 in the tenths place, so it is next.
Now compare 7.07, 7.70, and 7.707. Their tenths digits are 0, 7, and 7 respectively. So 7.07 (tenths 0) is smaller than the ones with tenths 7.
Between 7.70 and 7.707, compare the hundredths digits: 7.70 has 0 while 7.707 has 0? Actually 7.70 = 7.700, so hundredths digit is 0; 7.707 has hundredths digit 0 as well? Wait: 7.70 is 7.700, so hundredths 0; 7.707 has hundredths 0? No, 7.707: tenths=7, hundredths=0, thousandths=7. So at hundredths place both are 0? Actually 7.70 = 7.700 has hundredths 0, thousandths 0. 7.707 has hundredths 0, thousandths 7. So compare thousandths: 0 < 7, so 7.70 < 7.707.
Thus ascending order: 0.77 < 7.007 < 7.07 < 7.70 < 7.707.
The number at the third place is 7.07.
Answer:7.07 (Option C)