The correct answer is: a) Complex verb conjugations.
Manipuri is a tonal language, which means that the pitch of a word can change its meaning. However, this is not a distinctive feature of Manipuri grammar, as many other languages are also tonal.
Manipuri does not have gender distinctions, which means that there are no separate words for male and female nouns. This is also not a distinctive feature of Manipuri grammar, as many other languages also do not have gender distinctions.
Manipuri does have a complex system of verb conjugations, which means that the form of a verb can change depending on the tense, aspect, mood, and person of the sentence. This is a distinctive feature of Manipuri grammar, as not many other languages have such a complex system of verb conjugations.
The use of honorifics is a feature of many languages, not just Manipuri. Honorifics are words or phrases that are used to show respect to someone of higher status.
In conclusion, the correct answer to the question “A distinctive feature of Manipuri grammar is its: a) Complex verb conjugations b) Use of honorifics c) Lack of gender distinctions d) Tonal system” is a) Complex verb conjugations.