Step 1: Context of the Non-Congressism Slogan
The slogan "Non-Congressism" was coined by Dr. Ram Manohar Lohia, a prominent leader of the Indian freedom struggle and socialist movement. The slogan was used to criticize the dominance of the Indian National Congress party and its perceived authoritarian nature in post-independence India. Dr. Lohia was a strong advocate for social justice, secularism, and federalism.
Step 2: Analyzing the Options
- (A) Dr. Ram Manohar Lohia: Correct. Dr. Lohia is credited with the popularisation of the slogan "Non-Congressism," advocating the need for a broader political spectrum beyond Congress.
- (B) Jayaprakash Narayan: Incorrect. While Jayaprakash Narayan was a leading figure in the Indian political landscape and opposed Congress dominance, he did not coin the term "Non-Congressism."
- (C) V. P. Singh: Incorrect. V. P. Singh, the former Prime Minister of India, was a critic of Congress, but he was not the originator of this slogan.
- (D) None of them: Incorrect. The correct answer is Dr. Ram Manohar Lohia.
Step 3: Conclusion
The correct answer is (A), as Dr. Ram Manohar Lohia coined the slogan "Non-Congressism" to challenge Congress's monopoly on power and advocate for a multi-party political system in India.
\[
\boxed{\text{Correct Answer: (A) Dr. Ram Manohar Lohia}}
\]