Concept:
Spelling-based questions test familiarity with correct word formation. The word \textit{consanguineous} comes from Latin roots: \textit{con} (together) + \textit{sanguis} (blood), meaning “related by blood.”
Explanation:
\textit{Consanguineous} is a formal English word used in biology, law, and social sciences to describe people who share a common ancestor or are related by blood.
For example:
\begin{itemize}
\item They belong to a consanguineous family line.
\item Consanguineous marriages are studied in genetics.
\end{itemize}
Option (B) is incorrect due to the wrong vowel placement (“segu”).
Option (C) is incorrect because it omits the “e” before the ending.
Option (D) is incorrect due to missing letters and incorrect vowel order.
Thus, only option (A) represents the correct spelling.