In this sentence, the subject is
"Grade school instruction in ethical and social values," which is a singular noun phrase. Therefore, the verb that follows should be singular.
Option (A) "values of respect and of tolerance, are" is incorrect because the plural verb
"are" does not agree with the singular subject
"Grade school instruction."Option (B) "value of respect, together with tolerance, is" is incorrect because it incorrectly treats
"respect" as the only value, while
"tolerance" is presented as a separate concept. However, the sentence implies that both
"respect" and
"tolerance" are part of the values being discussed.
Option (D) "value of respect and tolerance, are" is incorrect because, like option
(B), it incorrectly treats
"respect" and
"tolerance" as separate values, when they are both part of the same set of values.
Option (E) "value of respect, together with tolerance, are" is incorrect for the same reasons as options
(B) and
(D).Option (C) "values of respect and tolerance, is" is the correct choice. It treats
"respect" and
"tolerance" as a combined set of values, which is consistent with the intended meaning of the sentence. The singular verb
"is" agrees with the singular subject
"Grade school instruction."Therefore,
option (C) provides the most grammatically correct and logically coherent sentence.