Choose the correct sentence from the options given.

Correct sentence: The volume comprises twenty papers.

"Comprises" means "contains" or "includes." When used in the active voice it is followed directly by the items included and should not be followed by the preposition "of."

• Why "The volume is comprises of twenty papers." is wrong: "is comprises" mixes an auxiliary verb with the active verb and is ungrammatical. Use "The volume comprises twenty papers" or "The volume is composed of twenty papers."

• Why "The volume consists twenty papers." is wrong: the verb "consists" requires the preposition "of." Correct: "The volume consists of twenty papers."

• Why "The volume comprises of twenty papers." is wrong: when "comprises" is used actively it should not be followed by "of."

Summary: The best choice is the sentence that uses "comprises" correctly: "The volume comprises twenty papers." Other acceptable formulations are "The volume consists of twenty papers" and "The volume is composed of twenty papers."