Who has won the Baileys Women's Prize for Fiction 2015?
Step 1: About the prize.
The Baileys Women's Prize for Fiction is one of the most prestigious literary awards celebrating women writers across the world.
Step 2: Year 2015 award.
In 2015, the award was conferred on Ali Smith, the Scottish author, for her novel How to Be Both.
Step 3: Elimination of other options.
- (b) Rachel Cusk → A renowned novelist but not the 2015 winner.
- (c) Anne Tyler → Won the Pulitzer Prize for Fiction, but not the Baileys Prize 2015.
- (d) Sarah Waters → Another celebrated author, but not the winner of that year. \[ \Rightarrow \boxed{\text{Ali Smith is the winner of Baileys Prize 2015.}} \]
Each author's most celebrated award can be matched against the specific prize and year named in the question.
Matching the prize, year, and winning novel together points to option 1.
Hence, the correct answer is Ali Smith.