The correct phrase is B. "How do you do?"
How to explain
Identifying singular nouns in the sentences:
Sebie (singular noun)
Grade (singular noun)
Student (singular noun)
Parent (singular noun)
Pen (singular noun)
Dialogue (singular noun)
Time (singular noun)
Day (singular noun)
Correcting and completing sentences:
Sebie has two brothers. (Complete sentence with a singular noun "Sebie")
I am a grade one student. (Correcting grammar by adding "a" before "grade one.")
My parents ask me, "Where is your pen?" (Completing the sentence by using correct punctuation and quotation marks.)
I am writing a dialogue. (Completing the sentence with the indefinite article "a" before "dialogue.")
Responding to "What day was yesterday?":
The Complete Question
Which phrase is a common greeting?
A. How are you?
B. How do you do?
C. I am fine.
D. None of the above
Identify the singular nouns in the following sentences:
Sebie has two brothers.
I am a grade one student.
My parents ask me, "Where is your pen?"
I am writing a dialogue.
Respond to the questions:
What is the current time?
What day was the day before today?