Directions : In the following questions, some parts of the sentences have errors and some are correct. Find out which part of a sentences has an error. The number of that part is the answer. If a sentence is free error, your answer is No error.
Just outside my house are a playground for school boys and girls.

Options

A. Just outside my house
B. are a playground
C. No error
D. for school boys and girls

Answer

B

Explanation

Here, subject is playground (singular). Hence, a playground is the right usage.