IMPORTANT UNIT TEST HELP NOW!
YOU GET A LOT OF POINTS :)

Choose the item that is the best summary of the following sentence and that could be completed by writing an acronym in the blank. Low-flying aircraft, traveling close to Earth’s curved surface, can escape detection because sound waves travel in a straight line.

A) Low-flying aircraft travel close to ________ to escape detection.

B) Low-flying aircraft can escape detection by _______________.

C) Low-flying aircraft ______________ close to Earth’s curved surface.

D) Low-flying aircraft escape detection because _____________.