Answer:
Option A
Step-by-step explanation:
The scientific investigation question is based upon the observation. Here Joanna observed that tomato plants which are closer to her house produce large number of tomatoes as compared to the tomato plants in the busy street.
Therefore, the first question that must arise in Joanna's mind is why plants near to her house give higher yield?
The remaining questions are way ahead of the initial investigation question. For instance, whether the car exhaust is affecting the street tomato plants or not will be clear once a preliminary data collection and analysis is done
Hence, option A is correct