Which sentence uses a simile?

 - The ripe tomatoes were small red balloons.
 - The ripe tomatoes were like small red balloons.
This sentence uses a simile:
The ripe tomatoes were like small red balloons.
The words tomatoes and balloons are compared using the word like.
This sentence uses a metaphor:
The ripe tomatoes were small red balloons.
The words tomatoes and balloons are compared without the word like or as.