💡 Detailed Explanation
The correct choice is '心配することはありません' (there is no need to worry / you don't have to worry). The grammar pattern '〜ことはない' means 'there is no need to do...'. In comforting contexts, this is highly synonymous with '〜ないでください' (please don't do...). Sentence translation: 'Even if you fail, please do not worry / there is no need to worry.' The other choices mean: '心配するはずです' (expected to worry), '心配するかもしれません' (might worry), and '心配したほうがいいです' (should worry), which all convey opposite or inappropriate intentions.