which sentence or sentences have correct parallel structure?\nsummer weather in san francisco can be either…

which sentence or sentences have correct parallel structure?\nsummer weather in san francisco can be either warm or cold, depending on whether or not the fog rolls in.\nsummer weather in san francisco can be either pleasantly warm or quite cold, depending on whether or not the fog rolls in.
Answer
Brief Explanations:
Parallel structure requires matching grammatical forms for paired elements. In the first sentence, "warm" (adjective) and "cold" (adjective) are parallel, fitting the "either...or..." structure. In the second sentence, "pleasantly warm" (adverb + adjective) and "quite cold" (adverb + adjective) also use identical grammatical structures, making them parallel.
Answer:
A. Summer weather in San Francisco can be either warm or cold, depending on whether or not the fog rolls in. B. Summer weather in San Francisco can be either pleasantly warm or quite cold, depending on whether or not the fog rolls in.