Error spotting — collocations with 'interfere': Pick the erroneous part (A/B/C) — mark D if there is no error — 'Students should not take part / in party politics and political demonstrations / as they interfere in serious study / No error.'. Focus on correct preposition with 'interfere'.

Given data

• Parts: (A) Students should not take part (B) in party politics and political demonstrations (C) as they interfere in serious study (D) No error.

Concept/Approach: Fixed preposition — 'interfere with'
The verb 'interfere' takes the preposition 'with' when it means 'hinder/obstruct'. Hence, 'interfere with serious study' is correct.

Step-by-step correction
1) Replace preposition: 'interfere in' → 'interfere with'.2) Revised: '…as they interfere with serious study.'

Common pitfalls
Using 'in' after 'interfere' due to confusion with 'interfere in (a matter)' which implies meddling, not obstruction.

Final Answer
Part C is incorrect; use 'interfere with serious study'.