Which of the following are examples of irregular trends in a time series?

(A) Decrease in production due to a sudden strike.
(B) The rise in prices before festivals
(C) Unusual rise in income of the printing press due to the announcement of an election.
(D) Fall in crop yield due to floods.

Choose the correct answer from the options given below:

(A), (C) and (D) only

The correct answer is Option (2) → (A), (C) and (D) only

Irregular trends in a time series are caused by unexpected or unpredictable events.

(A) Decrease in production due to a sudden strike ✅ Irregular

(B) The rise in prices before festivals ❌ This is a seasonal trend

(C) Unusual rise in income of the printing press due to the announcement of an election ✅ Irregular

(D) Fall in crop yield due to floods ✅ Irregular