Replace the underlined verb with the correct verb form, if necessary: This sauce is great. It’s tasting really good.

The correct answer is: B. tastes

The sentence is in the present tense, so the verb “tastes” is the correct form. The other options are incorrect because they are not in the present tense.

• Has tasted is in the past tense. It would be used to describe a time when the sauce tasted good, but not necessarily now.
• Has been tasting is in the
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  present perfect tense. It would be used to describe a time when the sauce has been tasting good for a period of time.
• No change is also incorrect because the sentence
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  is already in the correct tense.

I hope this helps! Let me know if you have any other questions.