Correct Answer: (a) cleanest, a home worthy of
Solution:'Cleanest' must be replaced with 'clean' as "cleanest" is a superlative form of the adjective "clean." Superlatives are used to compare three or more items or qualities. However, in this sentence, there is no comparison being made between multiple homes or qualities. So, we can use the adjective "clean" alone. Hence, 'Clean, a home worthy of is the most appropriate answer.