Which of the following causes have been mainly responsible for the slow growth of real per capita income in India?

1. Rapid rise in population
2. Rapid rise in prices
3. Slow pace of progress in agricultural and industrial fields
4. Non-availability of foreign exchange

Find correct answer from the given below:
Codes:

A) 1 and 2 only

B) 1 and 3 only

C) 1 and 4 only

D) All of the above

This MCQ is part of the UP PSC Previous Year Questions (PYQs) series, focusing on UPPSC Prelims 2001 (GS Paper I)