A clear tube containing a fish with a tag on its tailfin.

Which excerpt from Into the Unknown by Stewart Ross is best supported by the visual text feature?

As a keen zoologist (a student of animal life), she hoped to discover new species of insects and freshwater fish.
Trading as she went, she was always a cause of astonishment in villages where no European woman had been seen before.
The Mové steamed south along the coast, crossed the equator in the afternoon, and reached the broad mouth of the Ogooué by evening.
Kingsley made other journeys to Gabon to study her beloved Fang tribe, traveling through country that Europeans had not visited before.

The excerpt "As a keen zoologist (a student of animal life), she hoped to discover new species of insects and freshwater fish." is best supported by the visual text feature of a clear tube containing a fish with a tag on its tailfin.