Who among the following is the author of I know why the caged bird sings?

The correct option is Maya Angelou.

Detailed Explanation:
I Know Why the Caged Bird Sings is a celebrated 1969 autobiographical work by the prominent American writer, poet, and civil rights activist Maya Angelou. This book is the first in a series of seven autobiographies she wrote, detailing her childhood and early adult experiences. It describes her life growing up in the American South, dealing with racism, trauma, abandonment, and ultimate triumph through strength of character and the love of literature.

To provide additional educational context, let's briefly look at the other authors listed in the options:
• Toni Morrison: An acclaimed American novelist, essayist, and Nobel laureate famous for masterworks such as Beloved, The Bluest Eye, and Song of Solomon.
• Chimamanda Ngozi Adichie: A renowned contemporary Nigerian author known for highly acclaimed novels like Purple Hibiscus, Half of a Yellow Sun, and Americanah.
• Ama Ata Aidoo: An influential Ghanaian author, poet, playwright, and academic best known for works like Anowa and Our Sister Killjoy.