hello, I need help With this intro to statistical software question, on this question we use the program called Rstudio, i need help With question four along with parts A and b and explained and show the process through them step by step, I had asked tutors but some just show the answer to the questions but dont show the steps or the codes to get them and left me confused about it, please help me with this

below is the code for the question and question four itself, zoom in the picture so its easier to read, questions one, two and three have nothing to do with question 4 so please dont worry about them having any effect on 4.

please give be detailed on part a and b, as it is the only one i cant wrap my head around it, please and thank you

You may find the datasets in "ISLR" package for the rest of the questions. use the code: library (ISLR)4. We will now try to predict per capita crime rate in the Boston data set. (a) Try out some of the regression methods explored in this chapter, such as best subset selection, forward and backward methods. Present and discuss results for the approaches that you consider (b) Propose a model (or set of models) that seem to perform well on this data set, and justify your