Find the error in the sentence: a. I wish I would have been at the wedding, but I was in India then. b. Bhutan is one of the least densely populated country in the world​

a). I wish I would have been at the wedding, but I was in India then.

b). Bhutan is one of the least densely populated country in the world​

Explanation:

The errors in the above two sentences are the incorrect use of 'then' in the first sentence and the wrong usage of the singular noun 'country' after the phrase 'one of the.' The use of then in the sentence is inappropriate as there is no need to indicate the time as it adds an informal touch to the sentence because it is already understood that the speaker desired to attend the wedding but he couldn't due to being in India. In the second sentence, it is grammatically incorrect to employ a singular noun after the phrase 'one of the' and therefore, it must be 'countries' instead of 'country.'

i believe the answer is: b. mr. head had a long, tube-like face with a rounded open jaw and a short depressed nose.

this is because in the un-revised sentence it said that mr. heads face was long and tube-like, and he had a rounded open jaw. this is not a very grammatically correct because of how it seems to drag on with the and, replaced with, with, makes it sound more fluent in the description.