Final answer:
The best choice is to plant tomato seeds in the spring season, as they need warm weather and no frost, which aligns with spring conditions.
Step-by-step explanation:
The question requires the selection of the most appropriate seeds for a given season and soil type. Option A, planting corn seeds in the winter, is not suitable because corn requires a warm climate to grow. Option B, planting pumpkin seeds in sandy soil, can work since sandier soils drain well, which pumpkins prefer. However, they also require nutrients that might need to be added to sandy soil. Option C is the most viable choice, since tomato seeds are ideal for spring planting when the weather is warmer and there is no risk of frost, which tomatoes cannot tolerate. Option D, planting wheat seeds in a desert climate, is not generally a good choice because wheat requires more water than a desert typically provides. Thus, the most appropriate answer is C, planting tomato seeds in the spring season.