Answer: Taking the train.
Step-by-step explanation:
The options to the question include:
a. Driving her car
b. Biking to work
c. Taking an Uber
d. Taking the train
Since Gaby lives one hour away from work and wants to make the most of her commute time to work on her business plan for her side hustle while also saving for commute cost, the ideal mode of transportation that she should use is the train.
Driving her car to work, biking to work or taking an Uber will be costlier than taking a train which is quite cheaper when compared to others.