2019 Gauss 8 Problem 14

The two equal-arm scales shown are balanced. Of the following, \bigcirc\triangledown\triangledown\triangledown has the same mass as

\textbf{(A)}\ \square\square\square\quad \textbf{(B)}\ \triangledown\triangledown\square\square\quad \textbf{(C)}\ \bigcirc\bigcirc\bigcirc\bigcirc\quad \textbf{(D)}\ \bigcirc\bigcirc\bigcirc\square\quad \textbf{(E)}\ \bigcirc\bigcirc\bigcirc

If there are no answer choices shown, enter a numerical answer.

Full credit to this problem is given to the CEMC, you may view all Gauss contests here.