(a) The thieves discovered /(b) that only two empty safes

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(a) The thieves discovered /(b) that only two empty safes /(c) and a rusted box was inside the house. /(d) No error.

1. (a)
2. (b)
3. (c)
4. (d)

Correct Option: C

'Were inside the house'. The subject safe + box is plural.