In the following passage, some of the words have been left out. Read the passage carefully and select the correct answer for the given blank out of the four alternatives.
We all experience and understand that the current times are not very safe in general. One has to be on a ______ guard against unfriendly elements. As we move towards the Golden Age on the planet, a ______ of negative forces have surfaced. It is by bringing them to the surface that the divine forces can put them to an end. It is like the ______ that surfaces when we boil sugar in water, which is ready to be removed from the top so that what we get is sugar solution ______ of all the impurities. This process of cleansing our planet by the universal forces, however, will take some time. Till then, we have to ______ these negativities around us.
It is like the ______ that surfaces