To solve this problem, we need to identify which option lists only macronutrients. Macronutrients are elements required by plants in relatively large amounts.$\newline$Let's analyze each option:$\newline \bullet$Option 1: Boron, zinc, manganese$\newline$ - Boron, zinc, and manganese are all micronutrients, not macronutrients.$\newline \bullet$Option 2: Iron, copper, molybdenum$\newline$ - Iron, copper, and molybdenum are also micronutrients.$\newline \bullet$Option 3: Molybdenum, magnesium, manganese$\newline$ - Molybdenum and manganese are micronutrients, while magnesium is a macronutrient.$\newline \bullet$Option 4: Nitrogen, nickel, phosphorus$\newline$ - Nitrogen and phosphorus are macronutrients. Nickel is a micronutrient, but the question asks for all three to be macronutrients.$\newline$Upon reviewing the options, it seems there is a mistake in the question or options, as none of the options list three macronutrients. However, Option 4 contains two macronutrients, which is the closest match.$\newline$Therefore, the correct option, based on the closest match, is Option 4.