After a Union Election Campaign Among the Employees of Coding

After a union election campaign among the employees of Coding Company, the Data Workers Union does not obtain a majority vote in the election. The National Labor Relations Board may certify the union

A) if the union petitions for the certification within ten days.
B) if the employer issued threats or engaged in other unfair labor practices.
C) if at least 30 percent of the workers voted in favor of the union.
D) under no circumstances.