Which of the following, if true, most seriously weakens the argu-ment above?
Rice, which does not contain calcium, counteracts the effects of oxalic acid on calcium absorption.
Dairy products, which contain even more calcium than spinach does, are often eaten by people who eat spinach on a regularbasis.
Neither the calcium nor the oxalic acid in spinach is destroyed when spinach is cooked.
Many leafy green vegetables other than spinach that are rich in calcium also contain high concentrations of oxalic acid.
Oxalic acid has little effect on the body s ability to absorb nutrients other than calcium.
5.Joyce: Three years ago the traffic commission modified our town s busiest intersection for better visibility, a commendable effort to cut down on traffic accidents there. Gary: Over the past three years there have been more, not fewer, traffic accidents per week at that intersection, so the modification has increased the likelihood of accidents there The answer to which of the following questions would be most useful in evaluating Gary s argument?
What proportion of the town s drivers involved in accidents that occurred prior to the modification suffered personal injury in their accidents?
How long, on average, had the members of the traffic commission held their offices when the modification was implemented?
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