Why is the peace at the end of the play a “glooming” or gloomy peace?
a.
because the sun will not emerge from behind the clouds this day
b.
because the friar, who everyone respected, was involved in inappropriate dealings
c.
because the reconciliation of the two families is overshadowed by so many deaths
d.
because all the people in the churchyard will be punished by the prince for their part in the deaths

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.