**Explanation:**

The correct answer is option 'D' - Decelerated by 2-3%.

Reforms in the agricultural sector generally aim to improve productivity, increase efficiency, and promote sustainable growth. These reforms can include measures such as liberalization of markets, introduction of new technologies, investment in infrastructure, and changes in government policies.

**Factors Impacting Agricultural Growth Rate:**

1. Technology and Innovation: The adoption of modern technologies and innovative farming practices can significantly enhance agricultural productivity and output.

2. Infrastructure Development: Adequate infrastructure, including irrigation facilities, transportation networks, and storage facilities, is crucial for improving agricultural productivity and reducing post-harvest losses.

3. Market Reforms: Liberalization of markets and removal of trade barriers can encourage competition, increase market access, and improve price realization for farmers.

4. Government Policies: Supportive government policies in the form of subsidies, credit availability, and risk management programs can incentivize farmers to adopt new technologies and practices.

5. Climate Change: The impact of climate change, including erratic weather patterns, droughts, or floods, can have a significant influence on agricultural productivity and growth rates.

**Effect of Reforms on Agricultural Growth:**

When reforms are implemented effectively, they generally lead to an acceleration in the growth rate of the agricultural sector. This is because the reforms create an enabling environment that encourages investment, innovation, and improved productivity. Farmers can access better markets, adopt new technologies, and benefit from supportive government policies.

However, it is important to note that the impact of reforms can vary depending on several factors, including the pace of implementation, the effectiveness of policy measures, and external factors such as climate change.

**Deceleration of Growth Rate:**

In the given question, the correct answer is option 'D' - Decelerated by 2-3%. This implies that after the initiation of reforms, the growth rate of the agricultural sector slowed down by 2-3%.

The specific reasons for this deceleration are not provided in the question. However, it is possible that certain factors hindered the expected positive impact of the reforms. These could include challenges in the implementation of reforms, inadequate investment in infrastructure, insufficient access to credit and technology, or adverse climatic conditions.

It is important to consider that agricultural growth rates can fluctuate over time due to various factors, and the impact of reforms may not be immediate or uniform across all regions. Therefore, continuous monitoring and evaluation of the reform process are essential to address any challenges and ensure sustained growth in the agricultural sector.