Morning Star

Explanation:
The name "Morning Star" is given to the planet Venus. Venus is the second planet from the Sun in our solar system and is often referred to as the "Morning Star" or the "Evening Star" due to its brightness and visibility in the early morning or evening sky.

Why is Venus called the Morning Star?
- Venus is called the Morning Star because it is often visible in the eastern sky shortly before sunrise.
- It is one of the brightest objects in the sky, and its appearance at dawn has been observed by humans for thousands of years.
- The planet's brightness is due to its highly reflective atmosphere, which reflects sunlight and makes it appear as a shining star.

Confusion with Other Options:
- Option a) Pole Star: The Pole Star, also known as Polaris, is a star that is located close to the north celestial pole and is used for navigation. It is not referred to as the Morning Star.
- Option b) Planet Jupiter: Jupiter is the largest planet in our solar system, but it is not known as the Morning Star.
- Option c) Star Sirius: Sirius is the brightest star in the night sky, but it is not associated with the name "Morning Star."

Conclusion:
In conclusion, the correct answer is option d) Planet Venus. Venus is referred to as the Morning Star because it is often visible in the early morning sky and appears as a bright, shining object.