Select the correct answer.
Which sentence has correct parallel structure?
A. The tulips started to show signs of life and popping through the soil.
B. Dexter not only planned to go to the pool in the summer but also eating ice cream.
C. Crimson leaves, chilly days, and the sun setting early are all signs that autumn is approaching.
D. Ari layered on his winter gear, headed outside, and built a snowman.