Final answer:
Option (a), In Babylonian mathematics, the number 60 was represented by a symbol that looked like the numeral 1 in our modern system due to the base-60 numeration system they used.
Step-by-step explanation:
The number that looked like 1 in Babylonian math was 60. The Babylonians used a base-60, or sexagesimal, numerical system. In this system, the symbol for 1 was a small, vertical clay mark, similar to our numeral 1. However, this same mark was also used to represent 60, as their system was cyclic in nature.
To differentiate numbers in higher place values, the context in which the mark was used as well as the spacing and organization of the marks were crucial.