In this question option A) is as per G E Thomas standard and option B) is as per IEEE standard .
Here Manchester code 1000010111 is based on G E Thomas standard and 0111101000 is based on IEEE standard. Both are correct as there is no standard explicitly mentioned !!
But we generally follow IEEE standard thats why as per IEEE B is correct answer in this question .
Along with that, Rule for differential Manchester is, Let me post snap From Data Communication book ,Forouzen ->
Looking at this image, It is clear this book follow IEEE standard , And so this is differential Manchester.
AFAIK, there is no term as Integral Manchester, It was just put there for more confusion.