According to Mendeleev’s periodic table, what was the atomic mass of Eka-aluminium which was later replaced by Gallium?

Correct option is C

Eka-aluminium was the name given by Dmitri Mendeleev to an element that he predicted would have properties similar to aluminium but with a higher atomic mass. This element was later discovered and named gallium. He placed it in his periodic table as an element with an atomic mass of around 68.
The actual atomic mass of gallium, which replaced eka-aluminum, is 69.72 atomic mass units (amu).