Answer:
The relationship between the underlined words is that the first word in each pair is used to initiate or start the second word.
Explanation:
In the analogy "Match is to fire as key is to car," the relationship between the underlined words is that the first word in each pair ('match' and 'key') is used to initiate or start the second word ('fire' and 'car').
A match is used to start or initiate fire.
A key is used to start or initiate a car (by turning on the ignition).
