It has been suggested that the Dinomatron shortage was a conspiracy to drive up prices, but I disagree. First of all, no one could have
predicted the immense popularity of this toy. Just last year, a very
similar dinosaur-building kit was ignored by shoppers. Second, severe
winter weather all along the East Coast led to shipping delays,
contributing to the shortage. Could someone have conspired to create
bad weather? I don't think so. The Dinomatron price increase was the
natural result of supply and demand economics. During the busy
holiday shopping season, weather prevented toy stores from receiving
enough toys to fill demand. Therefore, they became more valuable.
Which of these is the author's claim?
A. Could someone have conspired to create bad weather?
B. Similar dinosaur-building kit was ignored by shoppers
N
C. The Dinomatron shortage was a conspiracy to drive up prices.
O O
D. Price increase was the natural result of supply and demand
economics

faulty parallelism is a grammar construction where there is no balance in the parts of a sentence they have a similar meaning but the grammar structure is not equivalent.

the correct version of this faulty parallelism in the sentence is:

jefferson wrote the declaration of independence, and he was the nation's third president.

the problem with the first version is that the sentence:

"jefferson was both the writer of the declaration of independence"

presents jefferson as both a subject and an agent for the verb "write" because if he was "the writer" then the declaration of independence was written by him, besides that fact, the sentence presents a dependent clause.

while the second sentence:

he was the nation's third president.

presents a basic subject+verb+object structure

so, to give a proper balance to the structure, or better said, to give a parallel structure, we must write a basic s+v+o structure in both sentences:

jefferson wrote the declaration of independence, and he was the nation third president.