The technique of communication by signs made with the fingers is called

Answer: Option A

Explanation:

The study of sound is called Acoustics.
The science or art of flight is called Aeronautics.
The philosophy of fine arts Aesthetics.
The science of soil management is called Agronomy.

Answer: Option B

Explanation:

The study of relation of animals and plants to their surroundings, animate and inanimate is called Ecology.

The study of insects is called Entomology.

The study of inscriptions is called Epigraphy.

Answer: Option C

Explanation:

The study of human races is called Ethnology.

The study of animal behaviour is called Ethology.

The study of origin and history of words is called Etymology.

Answer: Option B

Explanation:

The study of visual imagery and its symbolism and interpretation is called Iconology.

The practice of compiling dictionaries Lexicography

The study or collection of coins, paper currency, and medals is called Numismatics.

Answer: Option A

Explanation:

The scientific study of birds is called Ornithology.

The correct or accepted pronunciation of words is called Orthoepy.

The method and practice of teaching, esp. as an academic subject or theoretical concept is called Pedagogy.