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.