Levels of Diacylglycerol Increase in a Cell on Binding of a Ligand

Levels of diacylglycerol increase in a cell on binding of a ligand to a taste receptor. Which trimeric G protein subunit is most likely to be bound to GTP?

A) G_{q $\alpha$}
B) G_{t $\alpha$}
C) G _{$\beta$ $\gamma$}
D) G_{i $\alpha$}