Questions about the solar system

Which of the following ideas about star formation is true?
 
Planets are flung out of rotating stars.
 
Planets appear to be a common byproduct of star formation.
 
Stars explode to form giant molecular clouds.
 
Stars will last forever.
 
Stars are not actively forming.

My pick is planets appear to be a common byproduct of star formation.

Now do we know that the major bombardment era of the Solar System ended roughly 3.8 billion years ago?
 
From the age of rocks found in craters in Arizona and the Yucatan Peninsula.
 
From the age of rocks found in meteorites in Russia.
 
From the age of rocks found on the Moon.
 
From the age of rocks found on top of the Himalayas.
 
All of the above.

My pick was the ages of the rock found on the moon