What conclusion was drawn from the discovery that Gallium and eka-aluminum were the same element?

A.
Mendeleev’s periodic table allowed for accurate predictions about undiscovered elements.

B.
Two dissimilar elements could in fact be one and the same.

C.
Combining elements into one allowed for more room in the periodic table.

B. Two dissimilar elements could in fact be one and the same.

are you sure

Yes, I am sure. The discovery that Gallium and eka-aluminum were the same element (with Gallium being the actual element) showed that elements with different properties could actually be the same element in different forms, leading to the conclusion that two dissimilar elements could in fact be one and the same.