mvictor wrote:
goodyear2013 wrote:
To public health officials, monitoring infectious diseases present a complex set of challenges, especially in countries that lack the bureaucratic infrastructure necessary for keeping records on every case of illness.
I eliminated A because of the error - necessary for keeping - not good. Moreover, monitoring - is a single action, therefore, a verb in singular needs to be used.
A) To public health officials, monitoring infectious diseasespresent a complex set of challenges,
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