How did thousands of visitors contaminate the paintings in the lascaux caves?
a. people generated humidity and heat, which produced a fungus.
b. people introduced light into the caves, which caused fading.
c. people removed sections of the cave drawings, leading to erosion.
d. people started fires in the caves, burning the canvas.

beethoven's first public performance in vienna was on march 29, 1795. he gave a piano concert, or akademie, in vienna's burgtheater as part of an event organized by joseph haydn (probably op. 15). in these early years, beethoven's success as a composer was closely tied to his career and renown as a piano virtuoso.

explanation:

b. an anonymous prisoner from the warsaw ghetto