The correct answer is option 'D) Reliance Industries'.

Reliance Industries, led by India's richest man Mukesh Ambani, has announced plans to establish India's first carbon fibre manufacturing unit. This unit will cater to the aerospace and defense sectors. The company aims to make India self-reliant in the production of carbon fibre, which is a critical material used in the manufacturing of aircraft, missiles, and other defense equipment.

Below are the key details regarding Reliance Industries' plan to establish India's first carbon fibre manufacturing unit:

1. Company Profile:
- Reliance Industries Limited (RIL) is an Indian multinational conglomerate company headquartered in Mumbai, Maharashtra.
- It is one of the largest private sector companies in India, with diverse businesses including petrochemicals, refining, oil, and gas exploration, textiles, retail, and telecommunications.

2. Objective:
- The objective of establishing India's first carbon fibre manufacturing unit is to cater to the aerospace and defense sectors.
- The aim is to make India self-reliant in the production of this critical material, reducing dependence on imports.

3. Importance of Carbon Fibre:
- Carbon fibre is a lightweight, high-strength material that offers excellent mechanical properties.
- It is widely used in the aerospace and defense sectors for applications such as aircraft structures, missiles, rockets, and unmanned aerial vehicles (UAVs).
- Carbon fibre composites are also used in various other industries, including automotive, sports equipment, and renewable energy.

4. Significance for Aerospace and Defense Sectors:
- The establishment of a carbon fibre manufacturing unit by Reliance Industries will boost the indigenous production of this crucial material.
- It will reduce the dependence on imports, enhance the competitiveness of the Indian aerospace and defense industries, and contribute to the country's self-reliance in defense production.

5. Advantages of Indigenous Production:
- Establishing a domestic carbon fibre manufacturing unit will provide several advantages to the aerospace and defense sectors:
- Reduced costs: Importing carbon fibre can be costly due to transportation, customs duties, and other factors. Indigenous production will help in cost reduction.
- Shorter lead times: Domestic production will ensure a shorter lead time for the supply of carbon fibre, enabling faster production of defense equipment.
- Quality control: With an in-house manufacturing unit, Reliance Industries will have better control over the quality of the carbon fibre produced, meeting international standards.

Overall, Reliance Industries' plan to establish India's first carbon fibre manufacturing unit is a significant step towards enhancing the indigenous production capabilities of the country's aerospace and defense sectors. It will contribute to India's self-reliance in defense production and strengthen its position in the global market.