The Meson Having Which of the Following Quark Contents Has $b \bar { c }$

Multiple Choice

The meson having which of the following quark contents has electric charge -e?

A) $b \bar { c }$
B) $\mathrm { c }\bar { c }$
C) $\mathcal { u }\bar {a }$
D) $a \overline { s }$
E) $\mathrm { u }\bar { c}$