Find the mistake: Some (A) teenagers want (B) expensive clothes, can leads (C) to financial burden on (D) their parents.
Knowledge: Relative clause
In a relative clause we can use “which” to replace an entire clause, before “which” must use a comma. After the modal verb “can” must use the infinitive.
Can leads => which can lead
Translated: Some teenagers want expensive clothes, which can lead to a financial burden on their parents.