Which of the following themes was featured in literature of the new deal are?
a. the struggle of the working class.
b. man v. nature
c. love and friendship
d. the great journey

This Empirical evidence can be gathered using quantitative research and qualitative research methods.

Explanation:Empirical research method conducted can be using analysed quantitative and qualitative methods.

(1)Quantitative method: It is used to opinions behaviors or other defined variables.

(2)It is used to gather numerical data methods are survey polls.

(2)Qualitative method: it is used to find opinions,meaning,underline subject from its reasons.

(2)They are focus of groups, interviews,experiments.