How can I recreate this arrow diagram?

The hardest aspect is persuading tikz-cd that the top object can overlap the bottom ones.

documentclass{article}
usepackage{tikz-cd}

begin{document}

begin{tikzcd}[column sep=-1em,row sep=2.5ex]
& mbox{13 Total} arrow[dl] arrow[d] arrow[dr] & 
3C arrow[d] & 6B arrow[d] & 4E arrow[d] 
1C & 2B & 2E
end{tikzcd}

end{document}

You can play with the lengths until the result is what you like best.

egreg already gave the best answer, but able to meet the OP's requirement without using additional packages like tikz, and the code is:

documentclass{book}
usepackage{mathtools}
begin{document}

[
begin{array}{ccc}
multicolumn{3}{c}{text{13 Total}}
swarrow &downarrow &searrow
3C &6B &4E
downarrow &downarrow &downarrow
1C &2B &2E
end{array}
]

end{document}

Output

Since your image resembles a tree diagram, try drawing it with the forest specialized for such drawings:

documentclass[margin=3mm]{standalone}
usepackage{forest}

begin{document}
    begin{forest}
for tree = {math content,
            s sep=3mm,
            l sep=6mm,
            edge={->}}
[mbox{13 Total}
    [3C [1C]]
    [6B [2B]]
    [4E [2E]]
]
    end{forest}
end{document}

Addendum: Well, we all have different tastes. While I prefer the original answer (special its simple code), it looks like you like something similar to the picture below:

documentclass[margin=3mm]{standalone}
usepackage{forest}

begin{document}
    begin{forest}
for tree = {math content,
            s sep=3mm,
            l sep=6mm,
            edge={->}}
[mbox{13 Total}, name=r
    [3C, name=c,no edge [1C]]
    [6B [2B]]
    [4E, name=e,no edge [2E]]
]
draw[->] ([xshift=+1ex] r.south west) -- (c);     
draw[->] ([xshift=-1ex] r.south east) -- (e);
    end{forest}
end{document}