Someone please help me! Too Kill A Mockingbird chapters 20 & 21

the answer is:

b) to show the progression of inventions that took place in the bicycling industry.

hope it !

the pronoun reference replaces a noun, but you have to make sure there's no room for confusion.

in the first sentence "her" could be referring to shely or to the sister. the answer there is "shelly called her sister and told her about the new baby."

in the second sentence "it" could be referring to the roof or the floor. the answer there is "since the roof leaks on the family room floor, we need to repair the roof."

i think the answer is second

to show that social not the correct answer!