Identify the erroneous part in the following questions. If there is no error, choose option (E). 3. The technology, developed in (A) coal-rich Germany in the 1920s, (B) involves partly burning coal (C) to turn it into a gas, then using a catalyst, usually a metal (D) make it a liquid. (E) No error

Explanation: The sentence is: 'The technology... involves partly burning coal to turn it into a gas, then using a catalyst, usually a metal **(D) make** it a liquid.' The error is in part **(D) make it a liquid**. The structure should be parallel with the preceding infinitive phrase 'to turn it into a gas'. The correct form should be **'to make it a liquid'** or using a gerund phrase, or simply **'making it a liquid'**. The infinitive form is preferred for parallelism: '...to turn it into a gas, then using a catalyst... to **make** it a liquid.' Since only 'make' is underlined, the infinitive 'to' is missing, making it an error. (The provided solution gives a different error explanation about 'their'/'its', which is irrelevant).