A4 In the six-digit number $\square 36230$, the first digit is hidden. If we round the six-digit number to the nearest hundred thousand, we get 100000. What is the hidden digit?
(A) 0
(B) 1
(C) 3
(D) 4
(E) 9
A4 This is true for the digit 1, as 136230, rounded to the nearest hundred thousand, is equal to 100000.