A concrete mass containing 5% of voids
[ A ] Increases its strength by 30%
[ B ] Reduces its strength by 30%
[ C ] Increases its strength by 5%
[ D ] Reduces its strength by 5%
[ A ] Increases its strength by 30%
[ B ] Reduces its strength by 30%
[ C ] Increases its strength by 5%
[ D ] Reduces its strength by 5%