E.
They are the initial letters of the numbers 0-7 in words: Zero, One, Two, Seven
The next is 8 - Eight
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The question is stated wrong.It should be: "What is the next letter in the series O T T F F ?", and the answer is " S ".These are the initial letters of the words: One Two Three Four Five, followed by Six.
d
It looks as if every third letter is an "r"; the remaining letters are in sequence.
oNe, tWo, tHree, fOur,fIve,sIx etc. It is the second letter of each consecutive number
-57The first two numbers in the series has a difference of 89. The next two numbers (209, 129) has a difference of 80. The next two (129,58) has a difference of 71. As you can see the differences change by 9, so the next two numbers in the series (58, -4) has a difference of 62. Following this pattern, the next two numbers in the series will have a difference of 53. So the next number in this series will be (-4-53 = -57).