Which is an opinion? a) sometimes crewmembers jog on treadmills or play games of low-gravity basketball to keep their bodies in tiptop shape. b) when it’s mealtime, the astronauts make their way to the galley where they add water to their freeze-dried food and beverages at a hydration station. c) the international space station is a wonderful joint effort between the united states, canada, russia, japan, brazil, and the countries of the european space agency. d) though the astronauts’ main concern is completing daily experiments and maintenance tasks, they still need to eat, sleep, and play just like everyone else on earth.

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.