i just used pairing, can you explain me through math strategy why these options are correct
Pairing allows us to find possible synonym pairs for the question. “an obstacle to” and “a hindrance to” are a pair, as well as “a signal to” and “an indication for”. Pairing is done and we have to see which one of these are true.
Now, we might utilize the Math strategy as we read the sentence. We note that “since” indicates that there is a support between the first clause (“The spy’s repeated… her efforts”) and the second clause (“it was so unpredictable…her capture.”). The second clause states that the repeated bungling was so irregular that no one could figure out how to capture her. The first clause must have a similar idea. Thus, the spy’s repeated bungling was, above all else, (a difficulty to) those who wished to thwart her efforts, since it made it hard for them. Thus, the pair “an obstacle to” and “a hindrance to” is correct.
I hope this helps!