The least common way for the modern writers to convey their themes is through the use of explicit statements. Option A is correct.
The theme in a story refers to the underlying message, or 'big idea' the author tries to convey. Tu put it simply, theme may be the critical belief about life the authorattempts to express in the writing of a novel, play, short story or poem. This belief, or idea, goes beyond cultural barriers and is usually universal in nature.