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: The scientists developed a new robot. Sentence 2: It could do lots of different things. Sentence 3: They entered their best one in a competition. Sentence 4: It won for its ability to solve problems. Sentence 5: The team was proud of their accomplishment. Choices: a. The Robot. b. Night Stranger.
a