Conclusions: I. All Passages can be Streets

Solution

From Statement I. Some Streets are Roads (I) + All Roads are Passages (A) → Some Streets are Passages (I) → Probable conclusion → All Passages can be Streets (A). Hence conclusion I follows. No Footpath is a Street (E) + Some Streets are Roads (I) → Some Roads are not Footpaths (O*). Hence conclusion II does not follow. From Statement II. All Streets are Passages (A) → Probable conclusion → All Passages can be Streets (A). Hence conclusion I follows. All Roads are Footpaths(A) → Conversion → Some Footpaths are Roads (I). Hence conclusion II follows. From Statement III. Only a few Passages are Roads (I) + Only a few roads are Streets (I) → Probable conclusion → All Passages can be Streets (A). Hence conclusion I follows. Only a few roads are Streets (I) + A few Streets are Footpaths (I) → No conclusion. Hence conclusion II does not follow. From Statement IV. Only a few Passages are Footpaths + [All Streets are Footpaths (A) → Conversion] → Some Footpaths are Streets (I) → Probable conclusion → All Passages can be Streets (A). Hence conclusion I follows.   Only a few Passages are Footpaths (I) + [All Passages are Roads (A) → Conversion] → Some Roads are Passages (I) → No conclusion. Hence conclusion II does not follow.