Nowadays slanderous attacks . . . . . . . . common in politics, and people do not bother to tell lies. A. is B. are C. has D. am

The correct answer is “are”.

The sentence is in the present tense, and the subject is “slanderous attacks”. “Slanderous attacks” is a plural noun, so

The other options are incorrect because they are not in the present tense or because they do not agree with the subject.

• “Is” is in the singular present tense, but the subject is plural.
• “Has” is in the present perfect tense, but the sentence is not about something that has happened in the past.
• “Am” is in the first person singular present tense, but the subject is “slanderous attacks”, which is not a person.