The correct adjective form is 'dependable' meaning reliable or trustworthy. It follows the standard English suffix '-able' meaning 'capable of being' (depend-able = capable of being depended on). Options B, C, and D contain spelling errors: 'dependible' incorrectly substitutes 'i' for 'a', 'depending' is a present participle (verb form) not an adjective, and 'dependble' omits the vowel entirely. The correct pattern is that adjectives from verbs ending in consonant + silent 'e' typically use '-able' (remarkable, dependable, lovable).