2.1.1 What’s the trunk in the following long sentence?Hearing impairment （听力障碍） or other auditory function deficit （缺陷）in young children can have a major impact on their development of speech and communication, [resulting in a detrimental（ adj. 不利的）effect on their ability to learn at school].

A. SVO-Hearing impairment or other auditory function deficit in young children can have a major impact on their development of speech and communication.
B. SVP-Hearing impairment or other auditory function deficit in young children can have a major impact on their development of speech and communication.
C. SVO-Hearing impairment or other auditory function deficit in young children can have a major impact.
D. SV-Hearing impairment or other auditory function deficit in young children can have a major impact.