From the words or group of words lettered A to D, choose the one that best completes the sentence. My uncle is an expert ...Mechanical Engineering.

From the words or group of words lettered A to D, choose the one that best completes the sentence.
My uncle is an expert ...Mechanical Engineering.

Answer Details

The option that best completes the sentence is "in". This is because the word "in" is commonly used to show expertise or specialization in a particular field or subject. For example, someone can be an expert in a particular subject such as mechanical engineering.