Which option provides the best justification for the following? a teacher compares outcomes before and after an intervention without a control group. The design is vulnerable especially to
निम्नलिखित के लिए सर्वोत्तम औचित्य कौन-सा है? एक शिक्षक तुलना करता है परिणाम पहले और बाद एक हस्तक्षेप बिना एक नियंत्रण समूह. अभिकल्प विशेष रूप से इसके प्रति संवेदनशील है
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