(A) The pattern of the series is based on subtracting consecutive squares of integers.$99 - 95 = 4 = 2^{2}$$95 - 86 = 9 = 3^{2}$$86 - 70 = 16 = 4^{2}$

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(A) The pattern of the series is based on subtracting consecutive squares of integers.$99 - 95 = 4 = 2^{2}$$95 - 86 = 9 = 3^{2}$$86 - 70 = 16 = 4^{2}$Following this pattern,the next difference should be $5^{2} = 25$.Therefore,$70 - ? = 25$.$70 - 25 = 45$.Thus,the missing number is $45$.