What does the mass of an object depend on? A. Force of gravity
B. Temperature of the object
C. Time taken of an event to occur
C. Amount of matter that makes up the object

D or the 4th one

Explanation:

mass is literally the measure of matter in an object which is essentially the weight or how much stuff there is.

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