Structured programming practices (71) rise to Pascal，in which constructs were introduced to make programs more readable and better (72) . C provided a combination of assembly language and high-level Structure to create a general-purpose language that could be used from system to (73) programming. Next came object orientation，which is (74) of a methodology and design philosophy than a language issue．This is (75) by the addition of so-called OO extensions to current languages，such as C．

A．logic

B．function

C．flexible

D．application