Which of the following was not mentioned in the lecture as one of the instruments commonly used in flamenco? a. las castañuelas c. la trompeta b. la guitarra d. el cajón

I'm pretty sure it's: c) la trompeta My grandmother dances flamenco and I asked her and she said it was 'la trompeta' so there you go..! ;)

The instruments that isn't commonly used in "flamenco" is:

c. La trompeta.

Explanation:

The translation of the answer is:

c. The trumpet.

Flamenco is a dance originally from Andalusia (Spain), whose origins date back to the arrival of gypsies and Muslims in the region and the mix between custom and dance style between the locals and visitors, for its composition is they usually use the voice, palms, guitar, castanets, and a flamenco box. It is a dance with such a high international impact that in 2010 it was declared Intangible Cultural Heritage of Humanity by UNESCO.

there is no "following"