Choose the best revision, if one is needed, for the line marked (6).

A) NO CHANGE

B) aircraft opens onto the middle deck

Eliminate

C) aircraft will open onto the middle deck

D) aircraft will have opened onto the middle deck

Option B -- aircraft opens onto the middle deck

Explanation: Aircraft Opens onto the middle deck is absolutely correct as it shows that the opening of aircraft is still ongoing as against other two options -- (i) aircraft will open onto the middle deck (ii) aircraft will have opened onto the middle deck, of which the former is addressing a future occurrence, yet to happen while the latter is addressing an action that has been done in the past.

can you copy and paste what selections you read? the answer is based off of that.