Which code segment would you use to derive the numeric variable AVAL from AVALC by stripping off non-numeric characters?

Which code segment would you use to derive the numeric variable AVAL from AVALC by stripping off non-numeric characters?

A . aval = put(compress(avalc, ‘<>=’), best12.);
B . aval = input(compress(avalc, ‘<>=’), best12.);
C . aval = input(substr(avalc, 2,2), best12.);
D . aval = put(substr(avalc, 2,2), best12.);

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Answer: B