In the grass family the cotyledon is called:

The correct answer is Option (2) → Scutellum

Option (1) Hypocotyl — Incorrect. The hypocotyl is the part of the embryonal axis below the cotyledon.

Option (2) Scutellum — Correct. The embryo of grasses has one cotyledon, called the scutellum. It lies towards one side (lateral) of the embryonal axis.

Option (3) Coleorhiza — Incorrect. The coleorhiza is the sheath around the radicle and root cap.

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NCERT Extract:
Embryo – “… Embryos of monocotyledons (Figure 1.14 b) possess only one cotyledon. In the grass family the cotyledon is called scutellum that is situated towards one side (lateral) of the embryonal axis. At its lower end, the embryonal axis has the radical and root cap enclosed in an undifferentiated sheath called coleorrhiza. The portion of the embryonal axis above the level of attachment of scutellum is the epicotyl. Epicotyl has a shoot apex and a few leaf primordia enclosed in a hollow foliar structure, the coleoptile.”