Peg like mucron is present in

Answer: Option B

Peg-like mucron is present in Hirschmaniella sp.
Hirschmanniella oryzae, i.e. rice root nematode (RRN), is among the major pests of rice and is the most common plant-parasitic nematode found on irrigated rice.
The phasmids of this species are located in the posterior third of the tail, which is three to five times as long as the body width at the anus, tapering, and usually terminating in a point or mucron.