Step 1: Understanding the Question:
The question asks us to make a logical deduction from a given conditional sentence.
The sentence is in the form of a past unreal conditional (also known as the third conditional).
Step 2: Detailed Explanation:
The structure "If [past perfect], then [would have + past participle]" is used to talk about a hypothetical or unreal situation in the past.
The "if" clause, "If his latest movie had been a commercial success," describes a situation that is contrary to the actual facts.
This implies that in reality, his latest movie was not a commercial success.
Consequently, the main clause "the actor would have made enough money to sponsor his next movie" also describes something that did not happen. In reality, he did not make enough money.
Let's evaluate the options based on this deduction:
(a) The actor will certainly sponsor his next movie: We know he didn't make enough money, so this is unlikely to be true.
(b) The actor made enough money from his latest movie: This is the opposite of what the sentence implies.
(c) His latest movie wasn't commercially successful: This is the direct implication of the "if" clause. This statement is TRUE.
(d) His latest movie was a commercial success: This is the opposite of what the sentence implies.
Step 3: Final Answer:
Based on the grammatical structure of the sentence, the only true statement is that the premise of the "if" clause is false. Therefore, his latest movie was not a commercial success.