Questions: Which sentence is best structured to make a direct statement about an idea?

The question asks which sentence is best structured to make a direct statement about an idea. Let's evaluate each option:

1. "Since NASA was founded, it has sent more than 250 astronauts into space."

   • This sentence provides a clear and direct statement about NASA's achievements in sending astronauts into space. It is straightforward and factual.

2. "NASA is known for sending humans to the moon, but the famous space program has also sent an unmanned spaceship to Mars."

   • This sentence contains two ideas and uses a contrast ("but"), which makes it less direct than the first option.

3. "Some people think that NASA should focus on exploring the universe, but others believe that building a colony on the moon is the most important goal, even though it will be difficult."

   • This sentence presents multiple viewpoints and is complex, making it less direct.

4. "The mission of NASA is to explore outer space."

   • This sentence is a direct statement about NASA's mission and purpose.

The answer is the fourth one: "The mission of NASA is to explore outer space." This sentence is the most direct in stating an idea about NASA's purpose. It is clear, concise, and focused on a single concept.