The dropout rate in American schools is 10 timesthat of European nations.
In any case, The OE is required to confirm the OA. IMO, none of the choices fits in as the correct one. The comparison is between the dropout rate in American schools with the dropout rate in European schools and not with that of European nations. European Nations have no dropout rate.
a) that of European nations --incorrect as mentioned above.
b) what the rate is in Europe -- Europe is a continent and not a school
...
In any case, The OE is required to confirm the OA. IMO, none of the choices fits in as the correct one. The comparison is between the dropout rate in American schools with the dropout rate in European schools and not with that of European nations. European Nations have no dropout rate.
a) that of European nations --incorrect as mentioned above.
b) what the rate is in Europe -- Europe is a continent and not a school
...
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