This is MUSIC! Not "English" What is the name of the instrument that has the very first keyboard? Explain your reasoning.

A. Clavicytherium
B. Psaltery
C. Piano
D. Clavichord

Thx if you help! :)

5. the following question refers to the four selections by albert einstein: these readings show that, between 1939 and 1952, einstein a) abandoned science and turned to political activism. b) revised his opinions about the need for nuclear weapons. c) worked tirelessly to abolish nuclear weapons. d) devoted himself solely to scientific research.