An acronym is a word formed from the first one or more letters of each word in a group of words. If "UFO"is an acronym for "unidentified flying object," then for how many of the following word groups could MATH be an acronym?  $$\text{I}$$. Multiply All Those Hundreds  $$\text{II}$$. MArtians Take Hostages  $$\text{III}$$. MATthew Hides  $$\text{IV}$$. Minutes After The Hour 
Overseas Competition->Knowledge Point->Combinatorics->Logical Reasoning->Reasoning by Conditions
For $$\text{I}$$ and $$\text{IV}$$, use first letter of each word; for $$\text{II}$$, use first two letters of first word and first letter of other words; and for $$\text{III}$$, use first three letters of first word and first letter of second word. MATH could be an acronym for all four word groups.  $$\text{I}$$. Multiply All Those Hundreds  $$\text{II}$$. MArtians Take Hostages  $$\text{III}$$. MATthew Hides  $$\text{IV}$$. Minutes After The Hour 