During field research, Antonin finds himself in a lightning storm. What is the BEST precautionary measure for him to take?

A. seek shelter in a thick grove of trees
B. hide under the tallest tree he can find
C. head for the highest ground
D. lie flat on the ground in an open meadow

A. seek shelter in a thick grove of trees

Seeking shelter in a grove of trees can provide some protection from lightning strikes by reducing the risk of being the tallest object in the area. However, it's important to make sure the trees are not standing alone or isolated as they can attract lightning.