Correct Answer: Option C

Explanation

Blackflies (Simulium spp.) are vectors of the parasitic nematode Onchocerca volvulus, which causes onchocerciasis, also known as "river blindness". 

Blackflies are the intermediate host for the Onchocerca volvulus larvae, and they transmit the parasite to humans when they bite. 

There is an explanation video available below.

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