Correct Answer - Option 3 : baaba

The logic followed is:

Option 1 |
a |
**b** |
b |
**b** |
a |
b |
b |
**a** |
a |
b |
**a** |
a |
**b** |
b |
b |
a |

Option 2 |
a |
**b** |
b |
**a** |
a |
b |
b |
**b** |
a |
b |
**b** |
a |
**a** |
b |
b |
a |

Option 3 |
a |
**b** |
b |
**a** |
a |
b |
b |
**a** |
a |
b |
**b** |
a |
**a** |
b |
b |
a |

Option 3 |
a |
**a** |
b |
a |
a |
b |
b |
**b** |
a |
b |
**b** |
a |
**a** |
b |
b |
b |

Option (3) is giving a pattern of a**b**b**a**/abb**a**/ab**b**a/**a**bba

Hence, the correct answer is "Option 3".