Concept:Iron is needed by plants for making chlorophyll, the green pigment that traps light for photosynthesis.
Explanation:When iron is deficient, a plant cannot make enough chlorophyll.
This leads to chlorosis, which causes leaves to appear yellow.
The lack of chlorophyll reduces photosynthesis, so food production drops.
This weakens plant growth and results in stunted growth.
Iron deficiency also affects enzyme actions and metabolic processes, so leaves remain small.
Thus, the combination of stunted growth and small yellow leaves is a typical sign of iron deficiency.
Answer:B. iron