Quote:
D)films about the American West depict coyotes as if they were solitary, mournfully howling animals on the tops of distant hills
Let me delve into two aspects of this choice.
Point 1.
Please note that the use of "as they were" is not just a past tense. This is a special kind of past subjunctive, using the past tense verb 'were' instead of the normal 'are'.
Subjunctive mood sentences are special types of sentences, which violate the normal rules that apply to the subject-verb agreement in number and tense but are still considered grammatical. In the case of the past subjunctive, the grammatical form of the verb will be - I were, you were, he were, and they were- instead of the - I was, you were, he was or they were - forms.
Correct Examples:
The HOD thinks as if the staff were his errand boys
Some peons behave as though they were the GMs of the company.
Kusela spends as if he were Bill Gates.
We can note the differential but grammatically correct use of the present tense and the past tense within the same clause. , thanks to the past subjunctive mood.
Point 2. Reg: coordinate adjectives.
Co-ordinate adjectives are so called because they are parallel elements. Each of the coordinate adjectives modifies the common noun with equal weight. They can be seamlessly either separated by a comma between them or joined with a coordinate conjunction such as 'and'. In addition, one can exchange the order of the adjectives without loss of meaning.
Even if we say -- solitary, mournfully howling animals -- as --mournfully howling, solitary animals -- the meaning stays the same. Therefore, the takeaway is that one doesn't have to split hears whether there has to be an 'and' between these adjectives, and rest assured that a comma between the coordinate adjectives is good enough, a rare case of where a comma equals a coordinate conjunction
This not an opportune time to go into another diametrical contrast concept known as cumulative adjectives which are far more meaning-based. Good Luck