Which was the first programmable general purpose computer in the world?

The correct option is ENIAC.

Step-by-Step Explanation:

1. ENIAC (Electronic Numerical Integrator and Computer): Designed and built during World War II at the University of Pennsylvania by John Mauchly and J. Presper Eckert, ENIAC was completed in 1945. It is widely recognized as the world's first operational electronic general-purpose programmable digital computer.

2. Napier's Bones: Invented by John Napier in 1617, this was a manually operated calculating device created for calculation of products and quotients of numbers, not a computer.

3. Pascaline: Invented by Blaise Pascal in 1642, the Pascaline was an early mechanical calculator designed to add and subtract two numbers directly, making it an early calculating machine rather than a programmable computer.

4. Mark I: Built by Howard Aiken at Harvard in 1944 (Harvard Mark I), it was an electromechanical computer rather than a fully electronic general-purpose digital computer like ENIAC.

Thus, ENIAC is celebrated as the first programmable general-purpose computer.