Why does water tank appear shallower when viewed from the top?1). Due to reflection2). Due to refraction3). Due to diffraction4). Due to total internal reflection

Why does water tank appear shallower when viewed from the top?1). Due

1.	Why does water tank appear shallower when viewed from the top?1). Due to reflection2). Due to refraction3). Due to diffraction4). Due to total internal reflection
Answer» is DUE to REFRACTION is the CORRECT ANSWER?? am i RIGHT?