The sunshine colored the flowers yellow. The flowers of the parent plants were yellow. It was very warm when they flowered. It rained every day.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: A plant has yellow flowers. What best explains why the flowers are yellow?
Possibilities:
- The sunshine colored the flowers yellow.
- The flowers of the parent plants were yellow.
- It was very warm when they flowered.
- It rained every day.

The flowers of the parent plants were yellow.