The main clause is "Chris's chief interest was tennis".
The subordinate clause is "Which he was just learning to play" and it is an adjective clause because it describes what the "tennis" was like. Tennis is an object and this subordinate clause further describes that it is the tennis that he was trying to learn.
Excellance which is spelled Excellence
Answer:
A
Explanation:
We eliminate B because subject is singular (picture) and does not agree with the plural verb (have emerged).
C is not correct because in the first part of the sentence we have present perfect tense (Navigators have known….), in the second part we have simple past (n the last half century that a reasonably clear picture emerged….); there is not time consistency and it is not logical.
D is also eliminated for the same reason as B.
E has ambiguity since it is not clear if the pronoun 'their' refers to patterns or to currents.
Therefore, A is the correct option.
