Concept:The sentence requires the present perfect form of the verb "lie" (to recline) that agrees with the singular subject "My father".
Explanation:"My father" is a third person singular noun.
In the present perfect tense, a singular subject must take the auxiliary verb "has", not "have".
Therefore, any option beginning with "have" is grammatically incorrect.
The verb "lie" has two different meanings.
The first "lie" means "to rest in a horizontal position". Its principal forms are "lie", "lay", "lying", and "lain".
The second "lie" means "to give false information". Its principal forms are "lie", "lied", "lying", and "lied".
Since the father is resting on a bed, the context points to the meaning "to recline", not "to tell a lie".
In the present perfect tense, the auxiliary "has" must be followed by the past participle "lain".
Thus, the most suitable completion is "has lain".
Answer:D. has lain