Answer:
Quite educational
Step-by-step explanation:
The words before blank describing the film "Babies" are adjectives i.e. "humorous" and "eye opening", so we need to fill the blank by a suitable adjective ("quite educational") to keep the text structure parallel.
Filling the blank by "educated viewers" would be incorrect because of violating the rule of parallel text structure.
Parallel text structure means to use same pattern of words, phrases, or clauses to show that two or more ideas are at the same level of importance. Parallel structures are usually joined by conjunctions such as "and" or "or."