Select the option that expresses the given sentence in

Solution

The given sentence is in present continuous tense (is preparing).The passive voice of present continuous is formed as "is/are being + past participle."The correct transformation is: "A delicious meal is being prepared by the chef."(1) "is prepared" is simple present tense.(2) "has been prepared" is present perfect tense.(3) "is been prepared" is grammatically incorrect.Thus, the correct answer is (4) A delicious meal is being prepared by the chef.