Refer to the Figure

Refer to the figure.
The figure shows the influence of soil temperature on the interaction between two wetland plants, forget-me-nots and cattails. Cattails have extensive air channels for transporting oxygen in their leaves, stems, and roots. Forget-me-nots lack air channels. Based on the figure, as soil temperature increased, the influence of cattails on the growth of forget-me-nots changed from

A) neutral to negative (no effect to competition) .
B) positive to negative (facilitation to competition) .
C) negative to positive (competition to facilitation) .
D) positive to neutral (facilitation to no effect) .