Answer:
D. Neither the children nor their mother hides her delight at receiving presents.
Step-by-step explanation:
In any sentence which uses the "neither...nor" form, it is mandatory to see the structure of the sentence first. Neither....nor is a comparing word which is also a negative form.
Whenever the 'neither...nor' form is used, the verb form will be based on the subject nearest to it. The subject-verb agreement will depend on the singularity/plural form of the subject involved. In the sentence, the verb "hide(s)" will be judged or used based on the nearest subject which is "mother" thus making it singular. So, the verb will become "hides" and followed by the pronoun "her" instead of the plural "their" for "mother" is singular.
Thus, the sentence
Neither the children nor their mother hides her delight at receiving presents
is deemed the correct answer.