Explanation

DAP stands for Diammonium Phosphate, which has the chemical formula (NH4)2HPO4. Option A is incorrect as written. Option B represents Monoammonium Phosphate (MAP), not DAP. However, among the choices, none perfectly match (NH4)2HPO4. Wait, let me re-evaluate. DAP is (NH4)2HPO4. MAP is NH4H2PO4. The options are: A: (NH2) HPO4 (incorrect formula), B: NH4H2PO4 (MAP), C: NH4H2PO4 (same as B), D: Both a & c. None of the options are strictly correct for DAP. However, sometimes exams have typos. Option A looks like a typo for (NH4)2HPO4? Or maybe the question implies MAP? No, it asks for DAP. If I must choose, usually DAP is confused with MAP in bad questions, or option A is a typo for (NH4)2HPO4. Given the options, B and C are identical and represent MAP. Option A is chemically nonsensical as written ((NH2) is amide, not ammonium). If the exam key says A, it might be assuming a typo in the option text where (NH2) was meant to be (NH4)2? Or perhaps the question is wrong. I should flag this. Actually, looking at common MCQ banks for Pakistan exams, DAP is often listed as (NH4)2HPO4. If option A is (NH4)2HPO4 in the source but typed here as (NH2) HPO4, that's a transcription error. If I treat the text literally, none are correct. However, B/C are MAP. DAP has two ammonium groups. Option A has one nitrogen group written weirdly. I suspect option A is the intended answer due to typo in the prompt's representation of the formula, or the question is flawed. I will suggest needsReview because the options don't contain the correct formula for DAP ((NH4)2HPO4). B and C are MAP. A is invalid. Thus, the current answer A is likely based on a typo in the option text provided here vs the original source, or the question is wrong. I will set needsReview to true because the provided options do not contain the correct chemical formula for DAP.