Answer:
PPF will rotate rightward by technological breakthrough in making cloth only
Step-by-step explanation:
PPF is the graphical representation of two goods, that an economy can produce with given resources & technology.
If there is a technological breakthrough in only one good (cloth here) in economy (US here). The new PPF shift outward (rightwards or upwards) only on the axis representing that particular good (on x or y axis respectively). As cloth is on x axis, the PPF will rotate rightward by technological breakthrough in making cloth only.
Yes, on new rightward rotated PPF also, cloth & tea can be traded off, but at an altered slope & marginal opportunity cost (sacrifise ratio).