Read the excerpt from the building of manhattan. the boom is usually 70 to 90 feet long and is hinged to the mast at its base, so that both move together when the derrick swings to a new direction. which question can be answered only if an illustration accompanies the text? a- what is the shape of the boom? b- how long is the boom? c- does the boom move when the derrick swings? d- where is the boom attached to the mast? ( i didnt figure out the answer but i do know its not c or d)