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It is these poisonous products_____can cause the symptoms of the flu , such as headache and aching muscles .

A. who          B. that          C. how   D. what

. It is these poisonous products         can cause the symptoms of the flu , such as headache and aching muscles .

A. who                            B. that                    C. how                      D. what

It is these poisonous products____ can cause the symptoms of the flu, such as headache and aching muscles.

     A. who        B. that        C. how        D. what

It is these poisonous products _______can cause the symptoms of the flu, such as headache and aching muscles.

A. who               B. that                 C. how          D. what