A sentence divided into 5 parts is given, each of which is numbered. One of the parts of the sentence is missing and is marked by a blank. Choose the option as your answer, which when filled in the blank will render the first part of the sentence incorrect.
Documents and research recently revealed that (1)/ __________ (2)/ training from Russia and collecting military (3)/ equipment, which some have warned (4)/ could be used to promote separatism. (5)

Options

A. Local police in Republika Srpska are receiving military-style
B. Local police in Republika Srpska have been receiving military-style
C. Local police in Republika Srpska have necessarily received military-style
D. Local police in Republika Srpska are in all probability receiving military-style