The party for my parents is coming up soon.
Step-by-step explanation:
--- A is wrong because "students don't runs" they just "run" if it was singular then runs will be correct
--- B is wrong because same reason, you won't say "flowers looks beautiful", you will just say "flowers LOOK beautiful"
---C is also wrong for the exact same reason since the cat is singular, the verb will have an "s" at the end. so you will say "That cat on the pillows SLEEPS soundly"
D is the only one correct because the party is singular so the verb "is" will also be singular. IF the noun party was changed to parties, then the correct will be "The parties for my parents ARE coming up" but its not
so D is correct because it uses correct subject-verb agreement