- Fri Jan 22, 2021 6:47 pm
You're making more of "sets" than is in the word itself. A "set" of eggs is just a collection of eggs. As you point out, some eggs hatch into bugs with small wings, some into bugs with large wings. Lines 58-63 tell us why a bug may develop large wings - if the egg is formed in early autumn, it is exposed to cold temperatures, and if formed in early spring, it is never exposed to cold temperatures. "Eggs formed in autumn" and "eggs formed in spring" are the two sets of eggs, differentiated by when they are formed. There is nothing in the word "set" that indicates we can't form the idea of a set by a kind of definition. If, say, questions 20, 23, and 27 were the only hard questions in a section, then the section has two "sets" of questions: the easy ones (1-19, 21, 22, 24-26) and the hard ones (20, 23, 27). The questions don't have to be clustered in order, or have any other concrete property, to be able to form a set. Similarly, the eggs can be divided into "exposed to cold by being formed in autumn" and "never exposed to cold by being formed in spring", and that is the relevant difference between eggs that leads to a difference in wing size.
Answer choice (A) is describing what it means, and all it means, by "sets of eggs" with the statement after the comma. These "sets" are being created by defining what it means to be in each set.