दिए गए वाक्य के रेखांकित भाग को बेहतर बनाने वाले सबसे उपयुक्त विकल्प का चयन करें। From the 1930s onwards, advances in chemistry have led to insignificant improvements to reproduce the active ingredients in plants.

Select the option that improves the underlined part of the sentence: The boy told his teacher to explain the passage.

Select the option that improves the underlined part of the sentence: We demonstrated to them how we were prepared the artistic patterns.