The main theme in the adventures of huckleberry finn that concerns the duke and dauphin is
a- friendship and loyalty
b-pretending to be what is not
c-slavery as a socially accepted intstitution
d- the duality between what is right and what is legal

B-pretending to be what is not

Explanation:

In Mark Twain's "The Adventures of Huckleberry Finn," the duke and the dauphin represent the fraudulence and dishonesty of society. In that respect, even though Huck realizes that they are not actually royals and that they are deceiving the villagers with their performance, the frauds' greed still put Huck and Jim in difficult situations.

fears about being blown up

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.