Which one of the following is the correct structure for polystyrene? 
Definitions:
Skewed Sex Ratios
An imbalance in the number of males to females in a population, which can result from various factors including selective birth practices, migration, or mortality rates.
Girls
Refers to female children and young women.
Boys
Young male individuals, typically children or adolescents, distinct in development, behavior, and societal roles from girls.
Widowhood
The state or period of being a widow or widower, which involves adjusting to life after the death of a spouse.
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