Someone may you me with two questions !

which example below of light behavior best matches the behavior of a sound wave when you hear an echo?

question 16 options:

a pencil looking bent in a glass of water.

a person looking in the mirror

light waves bending when the move from the air into the water

a light wave heating a roof.

second question is a speaker was giving a speech to a class of students. the sound waves present are diagrammed below:

what best explains what happened to sound wave a?

question 15 options:

the sound wave was absorbed by the yellow material on the wall.

the sound wave stopped and transmitted.

the sound wave was reflected to the students.

the sound wave was absorbed by the air molecules.

picture if for part 2