What, if anything, is wrong with this code?

$studen{t}_s$core $=$ int$(input(Enterthisstudent\text{'}sscore$:$))$

score $=studen{t}_s$core $+5$

print$("$With the $5-$point curve, the student's score is $",$ scores, $".")$

Select one:

a$.$ the input$()$ function is chained with the int$(0)$ function

b$.$ a string variable is used in an arithmetic expression

c$.$ nothing is wrong with this code

d$.$ an undeclared variable name is used in the print$()$ function