The correct answer is: B. Abacus
An abacus is a calculating tool, originally invented in Babylonia and used throughout the world for centuries. It consists of beads sliding on wires strung on a frame. The abacus is still used today in some parts of the world, especially in Asia.
ENIAC, EDSAC, and UNIVAC are all early electronic computers. ENIAC was the first general-purpose electronic computer, and was used to calculate ballistics tables for the U.S. Army during World War II. EDSAC was the first electronic stored-program computer, and was developed at the University of Cambridge in England. UNIVAC was the first commercial electronic computer, and was used by the U.S. Census Bureau in 1951.
Therefore, the only option that is also known as SOROBAN is B. Abacus.