Hi The word 'yard' tells us that it is distance in question so I would rule out 3 and 4, unless I wanted to make a special point about how distant they were Between 1 and 2, I wouldn't make a definite judgement. I think that either the singular or the plural is acceptable. Different regions and different people have slightly different views on this.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
navitasanWhich are correctSentences 1 and 3 are certainly correct. Sentence 2 and 4 may be used by some speakers, but they are not so certainly correct. The addition of "of distance" changes nothing even though it may seem that putting a singular noun into the mix should make a difference. I think you're aiming for this: