Final answer:
The correct sentence is D) 'The baker who baked that bread should win an award.' The pronoun 'who' is used correctly as the subject of the verb in this instance.
Step-by-step explanation:
In selecting the correct sentence from the given options, we need to understand the use of Who, Whom, Which, and That when referring to people or things. In this case, the right choice is D) 'The baker who baked that bread should win an award.' The pronoun 'who' is correctly used as the subject of the verb 'baked'. 'Whom' is incorrect here as it is used as an object not a subject. 'Which' and 'that' are typically used to refer to things, not people.
Learn more about Subject and Object Pronouns