You want to know if compound A and compound B interact to affect the synthesis of ATP. With neither A or B there is no synthesis of ATP. When you have just compound A 10 nmoles of ATP are synthesized in one minute. When you have just compound B 30 nmoles of ATP are synthesized in one minute. When you have both compound A and compound B 100 nmoles of ATP are synthesized. From this data you would conclude that
a. none of the answers are correct.
b. Compound B is an antagonist for compound A receptors.
c. Compounds A and B act synergistically.
d. Compound A is an antagonist for compound B receptors.
e. Compound A can act on either A receptors or B receptors.

In the case of two compounds act together and produce or exert a pronounced effect or expression known as the synergistic action of the compounds. If they act separately the effect would be less in comparison to working together.

In the given question, when both compounds act separately they produce less ATP that is 10 and 30 respectively whereas when act together they produce 100 which suggests that Compounds A and B act synergistically.