Which of the following contains a vague pronoun reference?
A: A lichen is composed of an alga and a fungus. They name lichens based on the species of fungus.
B: A lichen is composed of an alga and a fungus. Biologists name lichens based on the species of fungus.
The first answer choice contains a vague pronoun reference. The pronoun they is used without its antecedent.
The second answer choice shows a possible correction for the vague pronoun reference. They has been replaced with biologists.
A lichen is composed of an alga and a fungus. Biologists name lichens based on the species of fungus.