Answer: Option B
The first computer fabricated and designed in India is Siddhartha, which was developed by the Electronics Corporation of Tamil Nadu (ELCOT) in 1974.
Siddhartha was a microcomputer designed for use in scientific and technological applications. It was developed by a team of engineers led by Dr. V. Rajaraman, who is considered to be the father of computer science in India. The name "Siddhartha" was chosen to honor the Indian philosopher and spiritual leader Siddhartha Gautama, also known as the Buddha.
Some of the features of Siddhartha were:

• It had a 8-bit microprocessor with a clock speed of 2 MHz.
• It had 4 KB of memory, which could be expanded up to 16 KB.
• It had an ASCII keyboard and a monochrome video display.

Siddhartha was used in a variety of scientific and technological applications, including process control, data acquisition, and numerical analysis. It was also used in education and training, as it provided an affordable and accessible platform for students to learn about computer programming and applications.
In summary, the first computer fabricated and designed in India is Siddhartha, which was developed by the Electronics Corporation of Tamil Nadu (ELCOT) in 1974.