(C) The pattern in the series is based on the addition of consecutive odd numbers starting from $3$.$7 - 4 = 3$$12 - 7 = 5$$19 - 12 = 7$$28 - 19 = 9$F

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(C) The pattern in the series is based on the addition of consecutive odd numbers starting from $3$.$7 - 4 = 3$$12 - 7 = 5$$19 - 12 = 7$$28 - 19 = 9$Following this pattern,the next difference should be $11$.Therefore,the next number is $28 + 11 = 39$.