@Science-Club when the size of particle lies b/w 1 to 1000nm then it acts like colloid and if less than 1nm then acts as true soln and acts like crystalloid.
@Science-Club crystalloid are the substance which can be crystallised easily from their aqueous soln and have size less than colloids
AS u can see that difference in ranks of letters above is either 2 or -2
SO in the given options the same pattern is followed by option 1
hence ans is option .
hope u understand.
@Kartik-Kumar sry my fault it doesnt depend on b ur right..
@Kartik-Kumar i think ans is d..