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The closest synonym for the word "reliable" is:
B. dependable
Explanation:
1. Reliable and dependable are synonyms that both indicate the quality of being trustworthy and consistent.
2. When something is reliable, it can be depended on to perform consistently and accurately.
3. For example, a reliable car is one that starts every time you turn the key and gets you where you need to go without breaking down unexpectedly.
4. Therefore, in the context of the question, "dependable" is the best choice as a synonym for "reliable" because both convey the idea of being trustworthy and consistent.