In this task, you're given five sentences, numbered 1 through 5, and two options a and b for possible titles for the story. Your job is to choose the title that better fits the story. Indicate your choice by 'a' or 'b'.

Sentence 1: I receiver sunflower seed from my sister. Sentence 2: I plant the seed in my garden. Sentence 3: Everyday, I water the seed. Sentence 4: It grows slowly after a few days. Sentence 5: Now the flower has bloomed. Choices: a. airplane. b. sun flower.
b