Directions: The statement below is followed by five others. Select the one which most complements the idea contained in the given statement.

Since children are less convenient to manipulate than guinea pigs, _________.

educational research is often short of hard data

doctors have to depend more on the latter than the former

the latter have to pay the price for the former's intransigence

the research findings from the latter source are generally considered to be more reliable than that obtained from the former

child psychologists are often compelled to use more data obtained from the latter sources