The underlined objective complement in the sentence "Critics called the mission unnecessary and wasteful" is "unnecessary and wasteful." An objective complement describes or modifies the object of the verb. In this case, "the mission" is the object of the verb "called," and "unnecessary and wasteful" describes the mission.
Looking at the provided options:
A. the - Determiner; does not fit. B. Critics - Subject; does not fit. C. mission - Object being described; fits the context but isn't the complement itself. D. called - Verb; does not fit.
None of these options directly correspond to the phrase "unnecessary and wasteful" as the objective complement. However, the most related option, since "mission" is the object being described by the complement, would be:
C. mission
But remember, "unnecessary and wasteful" itself is the objective complement.