Which of the following conditions indicate the impact of global warming?

1. Melting of glaciers
2. Rise in sea level
3. Changes in weather conditions
4. Rise in global temperature

Select the correct answer from the codes given below.
Codes:

A) 1 and 2

B) 1, 2 and 3

C) 2, 3 and 4

D) All the four

This MCQ is part of the UP PSC Previous Year Questions (PYQs) series, focusing on UPPSC Prelims 2009 (GS Paper I)