Which of the following sentences is punctuated correctly?

question 14 options:

the chili, which had been simmering on the stove for hours, made the whole house smell delicious.

my cat who is almost fifteen years old is getting a bit of gray fur around his nose.

my brother the valedictorian of his high school got into a very competitive college.

that toy helicopter which broke after only a few days was actually quite expensive.