The answer is c because if head appears and the spinner is spun with 1 - 4 on it then you can get either h1, h2, h3 or h4 and if tales appears and another coin is tossed you can get either th or tt
Just add them together to get the number. 100,000 + 702,083 = 802,083. 802083 is 100,000 more than 702,083.