Final answer:
In "Penny Lane" by The Beatles, the featured instruments include the trumpet, which is a prominent feature, as well as the guitar, bass, and drums, among others not listed in the options.
Step-by-step explanation:
In the song "Penny Lane" by The Beatles, the instruments featured are not exclusive to those listed in any of the options a to d provided by the student. However, one prominent instrument that stands out in the recording is the trumpet. This is heard clearly in the song's bridge, played by a session musician. The mainstay instruments of most Beatles recordings, which include the guitar, bass, and drums, are also present. Other instruments such as the piano, harmonium, and a brass section featuring additional horn instruments can also be heard.
The trumpet part in "Penny Lane" was played by David Mason and is one of the defining characteristics of the song. Although not specifically mentioned in the options, the trumpet closely resembles the sound of a piccolo trumpet, which is famous for its high-pitched tone, as opposed to the warmer tone of a flugelhorn. Based on the choices provided by the student and the instrumentation heard in "Penny Lane," none of the options perfectly match the instruments used in the recording.