\documentclass[border=10pt]{standalone}
\usepackage[linguistics]{forest}
\begin{document}
\begin{forest}
for tree={
nice empty nodes,
calign=fixed angles
}
[C,calign primary angle=45
[, before computing xy={for children={l'=0pt} }
[, grow'=west, [D ] [E ]
]
[, grow'=east, [A ] [B ]]
]
]
]
\end{forest}
\end{document}