In the sentence given below, four words/phrases have been underlined and the underlined words/phrases are given as options. Select the option that contains grammatical error(s).
$\underline{\text{The early years of civilian space travel}}$
$\underline{\text{has been marked}}$
$\underline{\text{by many triumphs}}$
$\underline{\text{and tragedies.}}$
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When identifying errors in sentences, check for subject-verb agreement. In this case, the plural subject "The early years" requires the plural verb "have."
The error lies in the phrase $\underline{\text{has been marked}}$.
Since "The early years" is a plural subject, the correct form should be: "have been marked".
The correct sentence is: "The early years of civilian space travel have been marked by many triumphs and tragedies."