Final answer:
The chosen title for Monty Python's BBC series was 'Monty Python's Flying Circus'. This show is known for its groundbreaking humor and has had a significant impact on comedy worldwide.
Step-by-step explanation:
The chosen title for Monty Python's BBC series, after considering options such as "Owl Stretching Time" and "A Toad Elevating Moment", is a) Monty Python's Flying Circus. This iconic comedy series became famous for its surreal humor, innovative sketches, and the use of animated sequences by Terry Gilliam. The show first aired in 1969 and quickly became a staple of British comedy, influencing countless comedians and writers around the world.