Can someone please help me. I need the answer right now please

Which of the following situations represents a linear relationship? a. theresa increases the distance she runs by 0.1 miles every week. b. the volume of a box depends on the length of box. c. the amount of money in a bank account increases by 1 percent each year. d. the population of a town doubles every 5 years.

How do you solve a question like this?

Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?