Which explains how the moon causes low tides on the earth?
a. the moon exerts pull on the earth. the pull stretches the earth's watery envelope and creates tidal bulges. where the water is thinnest is low tide.
b. the moon's gravity pushes on the earth. the push indents the earth's watery envelope and creates tidal bulges. where the water is pushed in is low tide.
c. the moon exerts a gravitational pull on the earth. the pull stretches the earth's watery envelope and creates tidal bulges. where the water bulges out is low tide.
d. the moon's gravity pushes on the earth. the push indents the earth's watery envelope and creates tidal bulges. where the water is pushed out is low tide.

The moon exerts pull on the earth. The pull stretches the earth's watery envelope and creates tidal bulges. Where the water is thinnest is low tide. The answer is letter A. Moon tides or lunar tides are caused by the pull of gravity between the moon and earth. The moon will exert a gravitational pull on earth and the earth also pulls the moon towards itself. The results is that the moon is near the earth and formation of oceans tide. Even though the earth can hold any object within its proximity, the ocean is partly attracted due to its liquid property. At night, the ocean tends to be attracted to the moon by creating a bulge and assigning it as ‘high tide’. This is due to the strong gravitational pull of the moon to the earth. 

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