People is plural. Can we say: people are a nuisance or people are a problem to be endured. The article 'a' is singular but 'problems' or 'nuisances' sounds weird here.
Top answer
People are a nuisance. People are a problem. Both are correct.
— CalifJim
People are a nuisance.
People are a problem.
Both are correct.
CJ
Free · every Monday
Get the Weekly English Kit 📬
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.