Answer: Province Day
Explanation: Commonly known holiday in Ecuador. Next time instead of saying the question in spanish use "Spanishdict.com" to translate to English. People wouldn't understand that you are asking what they celebrate on the 12th of February in Ecuador.
(La próxima vez, diga la pregunta en inglés)
Hey there! Your answer is: A. They were all physicists working on proving the existence of electrons
A because due to group of investors that is correct