Which words in the sentence form the participial phrase?

Sitting patiently, my mother read a magazine in the waiting room.

A.
my mother read

B.
in the waiting room

C.
read a magazine

D.
Sitting patiently

Question

Which words in the sentence form the participial phrase? 

Sitting patiently, my mother read a magazine in the waiting room.
 
 A.
my mother read
 
 B.
in the waiting room
 
 C.
read a magazine
 
 D.
Sitting patiently

anonymous · Answer

The participial phrase is always used as an adjective phrase to modify a noun or pronoun. It includes the participle together with its modifiers, objects, or predicate words. 
 
The present participle form always ends in -ing, but the endings for past perfect and passive perfect participles may vary.

anonymous · Answer

"Sitting patiently" is a phrase. The -ing form indicates that it could be a gerund phrase or a participial phrase. "My mother" is the subject. "Read" is the verb. "A magazine" is the verb's direct object. "In the waiting room" is a prepositional phrase. 
so i think its B

anonymous · Answer

By the way this shouldn't be in the math section