Which sentence does not use a comma properly?

a.
if you are interested in the rare books, you must travel to the thomas fisher library in toronto.
b.
the music collection contains jazz, rock, and more.
c.
the mitchell library of sydney contains original aboriginal art, and several pieces can be viewed online.
d.
the mitchell wing was completed in 1910, the dixson wing was not added until 1929.

answer: fvtedcsxztrfcdsx

explanation:

rbvfecdxsaznbtrvecdwxsqza

the illustration   that would give a reader a clear understanding of the text is a picture of men constructing the frame of a building.the frame is made of iron bars. the text describes the job of blacksmiths'. these were very organised and they had different names: "the driver" and "the heater". the text describes the way in which these men worked ; they worked iron pieces as if they were playing a sport. in fact, the text wants to show the men's skills. the text also puts some emphasis on the use of '' rivets'' in construction. this kind of nails were not always used in the construction of manhattan.

some examples:

"and with an underhand toss he hurled the smoking rivet straight at the catcher, who caught it in mid-air in his catching can." men's skills

"when the driver was ready for a new " the emphasis on the rivet ( special nail used in construction).

" it against a beam to remove any cinders, and jammed it into the waiting hole. " the emphasis on the rivet.