Botany–(a)– performed an elegant experiment with a/an — (b)— plant to show that in bright sunlight, small bubbles were formed around the –(c)— parts, while in dark they do not die.

--(a)-- performed an elegant experiment with a/an -- (b)--- plant to show that in bright sunlight, small bubbles were formed around the --(c)--- parts, while in dark they do not die.

A
a -Ingenhousz b - aquatic c - green
B
a - Ingenhousz b - terrestrial c - green
C
a - Priestly b - aquatic c - green
D
a - Priestly b - aquatic c - non-green

Solution:

Priestly performed an elegant experiment with a/an aquatic plant to show that in bright sunlight, small bubbles were formed around the green parts, while in dark they do not die.