Answer: A. abab
Step-by-step explanation:
If we want to identify the rhyme scheme, we need to focus on the ending sound in each line. The lines that have the same (or similar) ending sounds will be marked with the same letter. Whenever a line that ends with a new sound is introduced, it will have a new letter. In this particular example, the first and the third line end with the same sound (power and flower), and are marked with the letter 'a'. So do the second and fourth lines (fame and same), and they are marked with 'b'.