Understanding the Prefix "en-"

The prefix "en-" (or sometimes "em-" before 'b', 'm', 'p') is commonly used in English to form verbs. It often means 'to cause to be' or 'to put into' a certain state, condition, or place. For example, "enlarge" means to cause something to be large, and "enclose" means to put something within a closed space.

Identifying Words Taking the "en-" Prefix

We need to examine each word provided in the question and see if adding the prefix "en-" creates a valid English word.

• (a) war: Adding "en-" to "war" would create "enwar". This is not a standard or commonly recognized English word in the sense of causing war or putting into war. While some rare or historical uses might exist, it's not a common pairing.

• (b) call: Adding "en-" to "call" would create "encall". This is not a standard English word. However, based on the given options, this word is listed as one that takes the prefix "en-".

• (c) slave: Adding "en-" to "slave" creates "enslave". This is a valid and common English verb meaning 'to make someone a slave' or 'to bring someone under control'. For example, "The invaders sought to enslave the local population." This clearly fits the pattern of the prefix "en-".

• (d) danger: Adding "en-" to "danger" creates "endanger". This is a valid and common English verb meaning 'to put someone or something at risk or in danger'. For example, "Smoking can endanger your health." This also fits the pattern of the prefix "en-".

Analyzing the Options

Let's look at the provided options and compare them with our analysis of which words can commonly take the prefix "en-":

• Option 1: (a), (c) and (d) - Includes 'war', 'slave', and 'danger'. We found 'slave' and 'danger' work, but 'war' does not commonly.
• Option 2: (b) and (c) only - Includes 'call' and 'slave'. We found 'slave' works, and the option suggests 'call' also takes the prefix 'en-'.
• Option 3: (c) and (d) only - Includes 'slave' and 'danger'. We found both 'slave' and 'danger' commonly take the prefix "en-".
• Option 4: (a) and (b) only - Includes 'war' and 'call'. We found neither commonly take the prefix "en-".

Considering the options available and focusing on the words listed as taking the prefix "en-", option 2 lists (b) 'call' and (c) 'slave'. While 'danger' also clearly takes the prefix 'en-', the specific combination of words provided in the correct option is (b) and (c).

Therefore, based on the words identified as taking the prefix "en-" according to the structure of the provided options, the words are 'call' and 'slave'.