To answer this question, we need to understand the concept of redefining fields in COBOL.
In COBOL, redefining a field means using the same storage area for two or more different data items. The redefined fields must be of the same size or smaller than the original field.
In this case, we are considering redefining an X(10) field with a field of X(20). Since the redefined field is larger (X(20)) than the original field (X(10)), this is not allowed. Redefining a field with a larger field size would result in data loss or truncation.
Therefore, the correct answer is:
B. False - We cannot redefine an X(10) field with a field of X(20).