A Genetic Theory Says That a Cross Between Two Pink

Multiple Choice

A genetic theory says that a cross between two pink flowering plants will produce red flowering plants a proportion p = 0.25 of the time. To test the theory, 100 crosses are made and 31 of them produce a red flowering plant. Is this evidence that the theory is wrong?
What is the value of the standardized test statistic for this significance test?

A) -1.297.
B) 1.297.
C) -1.386.
D) 1.386.