The correct answer is: Only conclusion II follows.
The statement “People who speak too much against dowry are those who had taken it themselves” does not provide enough information to support conclusion I, “It is easier said than done.” It is possible that people who speak out against dowry are simply trying to make up for their own past mistakes, but it is also possible that they are genuinely opposed to the practice. Without more information, it is impossible to say for sure.
However, the statement does provide some support for conclusion II, “People have double standards.” If people who speak out against dowry are themselves guilty of taking it, then they are clearly not living up to their own standards. This suggests that some people may be hypocritical when it comes to the issue of dowry.
In conclusion, only conclusion II follows from the statement.