Final answer:
The American embassy's mission to Mars last year and the person who said this is not mentioned in the provided information.
Step-by-step explanation:
The given question asks about the success of the American embassy's mission to Mars last year and who said this. Based on the provided information, there is no direct mention of the American embassy's mission to Mars or any specific individual who commented on it. Therefore, none of the options A) President Biden, B) Captain Johnson, C) Ambassador Smith, or D) Astronaut Williams can be identified as the one who said this.