Which sentence contains a comma splice? To save the California condor, scientists trapped the surviving 27 birds and bred them in captivity, but the condor is still one of the rarest birds in the world.

Birds are the direct descendants of a type of small, feathered dinosaur, that means the dinosaurs are still alive!

Some scientists want to clone woolly mammoths, yet others worry that bringing an extinct species back from the dead could trigger an ecological disaster.

The last known Tasmanian tiger, nicknamed Benjamin, died in a zoo in 1936; the species was declared extinct after 50 years passed with no further sightings.

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.

b b b b b b   b b b   b b b b b

i would say b. good luck!