Final answer:
The correct sentence is 'c) Lynn speaks English and Spanish equally well,' which exhibits proper grammar and structure, unlike the other options which have issues such as variable meaning or incorrect capitalizations.
Step-by-step explanation:
The correct sentence among the options provided is "c). Lynn speaks English and Spanish equally well." This sentence is grammatically correct, with proper subject-verb agreement and clear, concise structure. It demonstrates Lynn's balanced bilingual abilities without any grammatical errors. The other options have issues: sentence a) could be contested due to the varying dates designating the start of summer, and sentence b) unnecessarily capitalizes 'Aunt' and 'Uncle' when they are not used as part of a proper noun.
Exploring the other exercises, vocabulary terms such as 'abdicate' and 'allegiance' are associated with foundations of the United States, suggesting a history context, and would be useful for conceptual understanding in Social Studies.
Lastly, when it comes to borrowing words from another language, usual candidates are nouns like technology, food, or culture-specific terms often reflect integration due to familiarity or lack of equivalent expressions in the borrowing language.