What Conclusion Should Be Reached About the Effectiveness of Head

What conclusion should be reached about the effectiveness of Head Start programs?

A) Head Start programs show few short-term gains for students,with benefits not recognizable until high school
B) Despite decades of research,no demonstrable gains have been demonstrated for Head Start programs.
C) Across both short- and long-term periods,the evidence of benefits is mixed.
D) Head Start programs show clear short-term benefits,and these become stronger through the middle school years.