Final answer:
A writer can indeed have more than one purpose for writing, which may include informing, persuading, entertaining, or expressing complex ideas and contradictions, making the correct option 'a. true.'
Step-by-step explanation:
It is indeed true that a writer can sometimes have more than a single purpose for writing. Writers can employ varying linguistic strategies, as observed when multilingual writers incorporate different cultural and linguistic norms to enrich their text. They might also simultaneously entertain and inform, or question and assert within the same work.
Writing is influenced by the rhetorical situation, which includes the narrator, message, audience, purpose, context, and culture. A writer's purpose could range from presenting a factual account, persuading the audience, to creating a complete work of fiction. This is compounded by the complexity of human intentions and the separation between the author's voice and the characters within the narrative.
A writer's intent is often multilayered, aiming to present particular facets of themselves or their ideas, sometimes leading to contradictions or paradoxes within their work. Therefore, the correct option in response to the question is 'a. true.'