Which one of the following elements will be an isobar of calcium if the atomic number of calcium is 20 and its mass number is 40?

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Q: 31 (CDS-I/2018)

Which one of the following elements will be an isobar of calcium if the atomic number of calcium is 20 and its mass number is 40?
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question_subject: 

Science

question_exam: 

CDS-I

stats: 

0,17,24,10,7,7,17

keywords: 

{'isobar': [0, 0, 0, 1], 'elements': [0, 0, 2, 5], 'calcium': [2, 0, 0, 4], 'neutrons': [0, 0, 1, 1], 'element': [0, 0, 0, 1], 'atomic number': [0, 0, 0, 4], 'mass number': [0, 0, 0, 3], 'protons': [0, 0, 0, 1]}