B.... cause c and d are for sure wrong
The sentence "<em>Bob plays guitar in his spare time"</em> represents a single sentence.
<h3>What is a simple sentence?</h3>
This refers to an independent clause which conveys a single and complete thought.
Hence, the <em>Bob plays guitar in his spare time"</em> represents a single sentence because its conveys a single and complete thought.
Therefore, the Option B is correct.
Read more about simple sentence
<em>brainly.com/question/897886</em>
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"Don't forget to pack an extra lunch for your friend Mary."