​What characteristic of some fluxes can help to push the weld penetration deeper?

​What characteristic of some fluxes can help to push the weld penetration deeper?
A) ​The larger mass of some bigger electrode flux coverings add a great deal of weight to the slag covering that force the weld penetration deeper.
B) ​Some fluxes act as a thermal blanket holding the heat into the weld which lets the weld penetrate deeper.
C) ​The formation of a crucible at the end of the electrode that acts as a combustion chamber.
D) ​The only way to get deeper weld penetration is to turn the welder’s amperage to the maximum.

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