The main purpose of the research presented in the text is...

A

compare the level of L2 proficiency of pilots to that of native language speakers.

B

discuss the consequences of miscommunication between air traffic controllers and pilots.

C

comment on the effects of high cognitive overload on air traffic professionals who are native speakers of English.

D

investigate accentedness, comprehensibility and fluency in L2 controllers and pilots communicating among themselves.

E

report on the effects of L2 proficiency and workload on speech production and retention of information in pilot-controller interaction.