To find out how much money Daniel has now, you need to add the amount he had initially to the amount his grandmother gave him.
Daniel's initial amount: $6.78
Grandmother's gift: $3.14
Now, add the two amounts together:
\[ 6.78 + 3.14 = 9.92 \]
Thus, Daniel has $9.92 now.
The correct answer is $9.92.