Numbers 4, 7, and 12 have parallel sentence structures. You can tell because the forms of the verbs are consistent: all -ing verbs, or all infinitive (to...).
The child Knew the answer to the question
2. Dependent (subordinate)
A is the answer. B has a 'plural verb' and a singular subject, as does C. D has a plural subject and 'singular verb'
1)
a. Were
b. was
2)
a. Were
b. were
3)
a. Was
b. was
