Why is sugar more soluble then salt

The oppositely charged ends of polar water molecules attract the ions and pull them away, resulting in dissolving. Sugar is made from sucrose molecules which are larger and more complex than the ions in salt .

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c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current

i think that the answer is c