Based on This Following Abstract Taken from a 2012 Issue

based on this following abstract taken from a 2012 issue of Psychological Science . The authors of the paper examined the effects of an intervention on adolescents' enrollment in STEM courses. Instructors are advised to use the reference below to retrieve the original abstract for their use.
Harackiewicz, J. M., Rozek, C. S., Hulleman, C. S., & Hyde, J. S. (2012) . Helping parents to motivate adolescents in mathematics and science an experimental test of a utility-value intervention. Psychological Science, 0956797611435530.
-Based on information in the abstract, which of the following is true about the findings of the study?

A) The researchers obtained a significant interaction effect.
B) The researchers failed to find any main effect to support their invention.
C) The researchers found a significant main effect supporting their intervention.
D) The researchers found a significant main effect suggesting that their intervention was not effective.