Leo needs a programming language that will allow him to add rules and information in order to solve problems in a logical way. Which choice would be best for him?

SQL
OHTML
Omachine language
Prolog

Prolog would be the best choice for Leo. Prolog is a logic-based programming language specifically designed for solving problems using a logical approach. It allows users to define rules and facts, which can be used to derive solutions to problems. With Prolog, Leo can add rules and information to the program and use its built-in inference engine to reason about the given information and find logical solutions.