Which sentence does not contain any errors in comma usage?

a.
it is, a hexagonal, traffic sign.

b.
jeremy has an old red wagon.

c.
the antique, and enormous clock stands in our living room.

d.
the stereo was designed with four, large speakers.

This question is obviously focused on commas, so if you say these sentences out loud and use breaks after every comma, you can tell which sentence doesn't make sense. So the answer is (d.).

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.