GMAT Sentence Correction (SC) | Re: A council of ecologists in Hawaii have concluded that much of the curr

Source: McGraw Hill GMAT

A council of ecologists in Hawaiihave concluded that much of the currently uncontrolled invasive species on the island chain were arriving in the holds of cargo ships.

A.have concluded that much of the currently uncontrolled invasive species on the island chainwere arriving
B.has concluded thatmany of the currently uncontrolled invasive species on the island chain arrived
C.have concluded that many of the currently uncontrolled invasive species