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(B) In the blast furnace,limestone $(CaCO_3)$ is added as a flux.$1$. It decomposes to provide $CaO$ $(CaCO_3 \rightarrow CaO + CO_2)$.$2$. The $CaO$

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$I, II$

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(B) In the blast furnace,limestone $(CaCO_3)$ is added as a flux.$1$. It decomposes to provide $CaO$ $(CaCO_3 \rightarrow CaO + CO_2)$.$2$. The $CaO$ reacts with silica $(SiO_2)$ impurities to form slag $(CaSiO_3)$,which is easily removed.$3$. Therefore,statements $(I)$ and $(II)$ are correct,while $(III)$ is not the primary purpose of adding limestone as $CO_2$ is a byproduct of the decomposition,not a supply requirement.Thus,the correct option is $B$.

Column-$I$	Column-$II$
$A$. Tapetum	$i$. Degenerate during development
$B$. Intine	$ii$. Resistant organic materials
$C$. Vegetative cell	$iii$. Pollen tube
$D$. Sporopollenin	$iv$. Provide nourishment to pollen grains

Limestone is present in the blast furnace production of iron in order to:
$(I)$ provide a source of $CaO$
$(II)$ remove some impurities
$(III)$ supply $CO_2$

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Column-$I$ Column-$II$

$A$. Tapetum $i$. Degenerate during development

$B$. Intine $ii$. Resistant organic materials

$C$. Vegetative cell $iii$. Pollen tube

$D$. Sporopollenin $iv$. Provide nourishment to pollen grains

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Limestone is present in the blast furnace production of iron in order to:$(I)$ provide a source of $CaO$$(II)$ remove some impurities$(III)$ supply $CO_2$