Answer:
An adverb clause of reason
Explanation:
Dependent clauses are clauses that don't express a complete thought, because of which they can't stand alone. Unlike independent clauses, without the rest of the sentence, they don't mean anything. There are three types of dependent clauses: noun, adjective (relative), and adverb clauses.
<em>Because he was very tired</em> is an adverb clause. Adverb clauses are groups of words (clauses) that function as adverbs. They modify verbs, providing additional information about when, where, why, how, how much or under what condition the action expressed the verb takes place. The clause <em>because he was very tired</em> informs us about the reason, about why the action from the main clause is performed. That's why it's an adverb clause of reason. These clauses usually begin with conjunctions such as <em>because, since, as, </em>and<em> that.</em>
[ Answer ]
One of the softball players left <u><em>their </em></u>bat at the field after practice.
[ Explanation ]
<em>Their </em>- Belonging to them
<em>They're </em>- Replaces the word(s) "They are"
<em>There - </em>A position
Out of the options Their, They're and There, the option Their is the correct option. This type of their means that the item belongs to them. The other two types are incorrect and out of context for this sentence.
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