Correct option is B)
Let us convert the given number in words into numerals as follows:
Eleven lakh=11,00,000
Seventy thousand=70,000
Six hunderd=600
Seven=7
Now, add the numerals as shown below:
1100000+70000+600+7=1170607
Therefore, the required number is 11,70,607.
Hence, the missing digit in 11,70,_07 is 6.