Explanation:
number of people or things that are located, gathered, or classed together is called group
Flashbacks are used to recount events that happened before the story's primary sequence of events to fill in crucial backstory.
I believe the answer is a.)
Explanation:
\begin{tabular}{|c|c|c|c|}
\cline(1-4)
\multicolumn{4} {lc|}{Elementary Particles} \\
\cline{1-4}
\multicolumn{2}{c}{Fermions) &
\multicolumn {2}{c}{Bosons) \\
\cline(1-4) Quarks & Leptons & Gauge Bosons & Scalar Bosons \\
\cline{1-4} Up & Electron & Photon & Higgs Boson \\
Down & Electron Neutrino & W and Z Bosons & \\ Charm & Muon & Gluons & \\ Strange & Muon Neutrino & & \\ Top & Tau & & \\\ Bottom & Tau Neutrino & & \\
\cline(1-4)
\end{tabular}
