What are common symptoms of phytotoxicity in plants?

B is the correct answer because common symptoms of phytotoxicity—an adverse reaction that plants may experience due to exposure to harmful chemicals such as herbicides or pesticides—include curling, cupping, twisting, and yellowing of leaves. These symptoms indicate that the plant is experiencing stress and is struggling to photosynthesize effectively due to the damage caused by the toxic substance. The physical distortions and discoloration of foliage are typical indicators that a plant is not handling a chemical treatment well.

In contrast, the other options describe either neutral or positive traits in plants. For instance, stunted growth accompanied by increased leaf size can indicate a lack of other nutrients or improper growing conditions rather than phytotoxicity. Greater flower production suggests a healthy plant response to optimal conditions, contradicting the negative effects associated with phytotoxicity. Lastly, increased resistance to disease implies a strengthening of plant health, which does not align with the detrimental impact that phytotoxic responses have on overall plant vigor. Thus, option B accurately captures the characteristics associated with phytotoxicity symptoms in plants.