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Below is the question I missed on Illinois' test (NFHS rules). What say you?

Team A makes a substitution during the time-out. After the time-out, it is discovered that A4 has replaced A7 illegally. The R2 should:

A. Disallow the substitution, signal unnecessary delay, placing the appropriate card on the wrist of the offending team and pointing to Team A's side.
B. Signal unnecessary delay, placing the appropriate card on the wrist of the offending team and point to Team A's side, and then allow the substitution to take place.
C. Signal illegal substitution, place A7 back on the court, and award a loss of rally/point to Team B.
D. Signal illegal substitution, place A7 back on the court, and award a loss of rally/point to Team B. The substitution is denied until the next dead ball.