Everyone in this world is accountable to God___ his actions.

The correct answer is -B

The correct preposition is `for'.

The given sentence seems to imply that everyone is responsible to God for his actions.

Accountable for -means responsible for.

Meaning of other options

1)about-Near,not far from,on the point of verge of,concerned with,regard to,on account of,on the subject of.We can use `About' in above context.It can refer to movement /position in various directions/places

2) to - It is used to indicate directions.To denote any thing which is at surface area, in rest position.

3) over- it is used to indicate place.

So these are contextually incorrect.

Also the expression `Accountable for' means to responsible for.So,usage of `For' will be correct here.