Sentence A is grammatically correct with proper tense agreement.
"Adopted" is the correct word as it means to accept or start using something new.
The correct preposition is "in," as in "proficient in.
"Completion" fits the context as it refers to finishing something.
"Comprehensive" means covering all aspects or details.
The correct form is "Each of the students has completed their assignments. "Each" requires a singular verb.
The correct verb form is "arrives" to match the present simple tense.
This is a complex sentence because it has an independent clause and a dependent clause connected by "although"
This sentence is in the passive voice because the subject (the report) receives the action performed by the manager.
"Intensify" is the opposite of "mitigate," which means to make less severe
"Accommodate" is the correct spelling.