Step 1: Understanding the data.
The suffix “-able” is added to a verb to form an adjective. For example, “readable” is the adjective formed from the verb “read.” This is a case of grammatical category change, as the word shifts from a verb to an adjective.
Step 2: Analyzing the options.
- (A) Sociolinguistic change: The addition of “-able” is not related to social language change, so this option is incorrect.
- (B) Grammatical category change: The suffix “-able” indeed changes the grammatical category from verb to adjective, making this option correct.
- (C) Semantic change: The addition of “-able” also leads to a shift in meaning, such as the verb “read” becoming “readable,” which refers to something that can be read. Thus, this option is correct.
- (D) Typological change: This suffix does not represent a typological change in the language structure, so this option is incorrect.
Step 3: Conclusion.
The correct answers are (B) grammatical category change and (C) semantic change.