I am not being able to answer, where is actually the force of gravity directed towards ?

Look at this picture.

This is a planet with the centre ‘C’. And O is an object. Every point of the planet is attracting the object,The points A and B are also pulling it towards themselves, then why do we say, the force is directed towards the centre?

Also, If i drop the object, will it move towards A , B or towards the centre ?