Answer:
The correct answer for the given question is option(b) i.e "Implicit conversion".
Explanation:
Implicit conversion converts one datatype to another without forcefully .it convert the one datatype to another automatically.The implicit type is a type safe conversion .
For example
int i = 57;
float f = l; // convert i to f without forcefully.
The explicit conversion converts one datatype to another forcefully .This type of conversion is not a type safe conversion.
double d = 765.12;
int i = (int)d; // convert d to i forcefully
so the correct option is option(b).