Another way to observe the linguistic changes in English over time is to consider the constant deviations in informal language and slang-changes that often are associated with specific generations. The cool, daddy-o' of the Beat generation in the 1940s and 1950s gave way to the 'groovy of the 1960s, each new generation finding its own slang. Soon the current use of 'on fleek will give way to even more modern language. (paragraph 3)
Which phrase from the excerpt best provides a clue to the meaning of the word deviations?

• A. "linguistic changes"
• B. "specific generations"
• C. "the 1940s and 1950s"
• D. "more modern language"