A(n) conversion occurs when c# converts one data type to another and the programmer has not provided code to perform the conversion.
a. explicit
b. implicit
c. narrowing conversion
d. widening

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).

true

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