Which lambda expression can replace the instance of new BiologyMaterial() in the Scientist class and produce the same results under various inputted values? 

A. (p,q) -> q==null ? p : p+1

B. (c,d) -> {int d=1; return c!=null ? d+1 : d;}

C. (x,y) -> {return x==null ? y : y+1;}

D. (a,b) -> 1

E. None of the above.

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package university; @FunctionalInterface interface Study { abstract int learn(String subject, int duration); } class BiologyMaterial implements Study { @Override public int learn (String subject, int duration) { if (subject == null) return duration; } } } else return duration+1; public class Scientist { public static void main(String[] courses) { final Study s = new BiologyMaterial(); System.out.print(s. Learn (courses [0], Integer.parseInt(courses [1])));