Match List I with List II:

	List-I		List-II
A.	Alfred Hershey and Martha Chase	I.	Streptococcus pneumoniae
B.	Euchromatin	II.	Densely packed and dark-stained
C.	Frederick Griffith	III.	Loosely packed and light-stained
D.	Heterochromatin	IV.	DNA as genetic material confirmation

Choose the correct answer from the options given below:

To match the items, we consider the definitions in List‑I and the descriptions in List‑II.

A. Alfred Hershey and Martha Chase performed the classic experiment that proved DNA is the genetic material. Therefore they correspond to IV. DNA as genetic material confirmation.

B. Euchromatin is the less condensed form of chromatin that stains lightly under a microscope, indicating a loosely packed structure. This matches III. Loosely packed and light‑stained.

C. Frederick Griffith discovered the phenomenon of transformation in Streptococcus pneumoniae, showing that a harmless strain could become virulent. Hence he is paired with I. Streptococcus pneumoniae.

D. Heterochromatin is the tightly packed, dark‑staining form of chromatin. This aligns with II. Densely packed and dark‑stained.

Putting all the pairs together gives the final matching: A‑IV, B‑III, C‑I, D‑II.